The chest had a mark he had not seen before.
Double horizontal. Two parallel lines scratched inside the lid, neat and deliberate, separated by a finger's width. He had seen the single line three times now and the cross once. This was new. He crouched over the open lid and looked at the mark for a moment, adding it to the inventory in his head. Different mark, different meaning. The single line had meant safe to open. The cross had meant fire. Two lines meant something else, something he could not predict from the previous two.
He reached in slowly this time, left hand first, testing the chest floor before committing his weight to it. No needle. He swept the interior methodically before taking anything out.
Inside: one food block, a small sealed pouch of water large enough for several days, and at the bottom, packed in oiled cloth, a cylinder identical to the one he had pocketed after the poisoning and not yet opened. He set both cylinders side by side on the planks.
Same casing. Same weight. Different end caps, one crimped shut like the antidote vial, one with a threaded mechanism that turned. The crimped one he already knew: medicine of some kind, or had been. The threaded one he had not opened. He turned the threaded cap. It gave smoothly. The cylinder opened along a seam he had not seen and folded outward in sections, each section locking flat against the previous, until what he was holding was not a cylinder at all but a sleeve. Structured, segmented, each section a slightly different organic texture. Green-grey in colour, slightly yielding to pressure, warm in a way the metal parts of the bridge were not.
He held it up and understood: it was meant to go on an arm.
Getting it on took longer than it should have. The right arm was the only real option, the left had the burn from wrist to forearm and the arrow still lodged above it, and the vine arm's sections needed to close over bare skin to seat correctly. He removed the watch and pocketed it. The sleeve went on in segments, each clicking into a locked position around his forearm and upper arm, and the last section, the one that covered his hand, had openings for his fingers so his grip was not blocked.
The puncture wound from the needle sat under the third segment. When the segment clicked shut over it the discomfort was specific and local, a pressure that his healing skin registered without enthusiasm. He flexed his fingers. The sleeve moved with him. The sections shifted slightly against each other, accommodating the motion.
He refastened the watch above the sleeve on his wrist where it could still be reached.
Now: what did it do.
He turned his arm over and looked at the segments. On the underside of the forearm section was a raised node, slightly darker than the surrounding material, that his thumb could reach without effort. He pressed it.
Something came out of the sleeve fast enough that he flinched back.
A vine. Green-grey like the sleeve material, roughly the width of a finger, extending from the wrist section and continuing outward until it reached about a metre and stopped. It hung in the air, slightly curved at the tip. He turned his arm and the vine moved with the rotation, suspended from his wrist by its own structure.
He pressed the node again. The vine retracted, pulling back into the sleeve in under a second.
He pressed it again. Same vine, same reach, same curl at the tip. He pressed it twice quickly. Two vines, extending together, crossing slightly at the tips before he released the node and they pulled back.
He pointed his arm at the left railing post four metres away and pressed the node and watched the vine extend and fall short by a metre and a half. He tried angling his wrist upward, pressing again. Shorter arc. The range was approximately a metre, a metre and a half at best, and the vine had no tension in it, it could not throw itself, only extend. He needed to be close to whatever he wanted to grip.
He pressed once more and tried to grip the plank in front of him by curling his wrist. The vine tip dragged across the plank surface without catching. He adjusted the wrist angle and tried again. This time the tip found the edge of the plank and the vine contracted slightly, not enough to hold against any real weight but enough to register contact.
'Close enough. Keep walking. Learn it while moving.'
He stood up and ate the food block and shouldered the water pouch and kept moving. He had been wearing the vine arm for eighteen minutes when the bridge tried to kill him with it.
No creak. No flex. No warning of any kind.
He was walking at normal pace in the centre of the bridge, vine arm hanging at his side, and the section of floor beneath him dropped. Not one plank. A span of six or seven, connected by the same crossbeam below, going all at once, releasing from their moorings in a single soundless failure and simply falling away into the dark.
He fell with them.
For a fraction of a second he was still standing, the floor just gone, his legs continuing a walking motion with nothing under them. Then the drop took him and he went down and the underside of the bridge was above him, the crossbeams and longitudinal supports he had never seen from below, the planks he had been walking on now an edge against the grey light.
The vine arm fired.
Not from him. He had not decided anything. His right arm swung upward on instinct and the vine extended before the thought could form and the tip shot out and missed the first beam cleanly and hit the second at the wrong angle and skidded off and for one full second he was in freefall with the void below him and nothing caught.
Then the vine corrected. His wrist had rotated in the fall, changing the angle, and the tip struck the beam again and this time the contact held, the vine tip finding a groove in the wood and locking, and the extension snapped taut and the jolt went through his right shoulder and down his arm and the puncture site screamed and he stopped falling.
He was hanging below the bridge. Right arm above him, vine connecting his wrist to the beam. The fallen planks were gone, already deep in the void, no sound reaching back up. The underside of the bridge was six inches above his head. The edge where the floor had been was two metres to his right.
He did not look down.
His right arm was taking his full weight. The puncture wound was in the third segment, and the vine's activation had tightened all the sleeve sections uniformly, pressing the segment against the wound with a grip that would have been unacceptable under any other circumstances. He was not in a position to object.
He needed to get back up. Two metres to the right, the bridge edge. He had to close that distance while hanging from one arm.
He tried to use his left arm for the first pull. The burn on the forearm stopped him at elbow height, the movement required straightening the arm against the scarred skin and the scarred skin declined. He got perhaps thirty degrees of useful extension before the pain overrode the effort and the arm came back down. The arrow in the shoulder above it had not been disturbed by the fall and he did not intend to disturb it now.
So: right arm only. And legs.
He swung his legs. Got them up toward the underside of the bridge, the soles of his feet finding a longitudinal beam and pressing against it. Pushed. His body rose slightly and his right arm took more weight and the shoulder joint registered something new, a warning in the tendon, and he stopped the push before it became a tear.
He held there, feet against the beam, right arm above, body horizontal below the bridge, and breathed and thought about the geometry.
The edge was two metres right. He needed to traverse two metres while hanging from a single vine extension that had a maximum range of a metre and a half and did not throw. He could extend to a new beam, release the first, drop slightly, catch again, but each catch required the vine to grip something, and his grip control was nowhere near that precise yet. He had been wearing this thing for twenty minutes.
He tried it once. Extended toward the next beam to the right, pressed the node. The vine tip swept out and caught air and missed entirely and he retracted and held what he had.
He tried again. Rotated his wrist a degree right of his previous angle, pressed. The tip struck the beam at the edge and held for a second and then the vine slipped and he was back where he started.
His right shoulder was burning now. Not the arrow shoulder. The suspension shoulder, the joint that had been bearing his weight for four minutes. He was going to lose the arm before he lost the vine.
He stopped trying to traverse and looked at the edge directly above him. The drop zone's right edge, where the planks had released from the bridge structure, left a ragged lip of wood protruding a few centimetres. Not much. Enough.
He pulled hard on the vine, not traversing, just pulling himself directly up toward the beam. His shoulder screamed. His legs pushed from the beam below, adding force. He got his left hand to the lip of the bridge edge, the burn be damned, and got three fingers over it, and pulled again.
His left forearm was on the bridge surface. Then his right elbow, vine still extended. He kicked his right leg up and found the bridge edge with his heel and pushed and rolled and came up onto the planks and lay there face down with both arms stretched out and did not move.
He lay on the planks for a long time.
The vine retracted on its own after thirty seconds. He felt it go, the tension releasing, the sleeve returning to resting state. The puncture site under the third segment was hot. His left forearm was worse than before, the effort of the final pull having pulled the burn skin against itself. His right shoulder joint ached deeply in a new and specific way, the tendon complaint that he had avoided tearing now making itself known in the aftermath.
He turned his head and looked at the gap in the bridge where the floor had been. Six planks gone, the crossbeam they had been attached to visible now, its surface showing the groove where the vine tip had finally caught. Clean wood. No rot, no weakness he could see from here. The planks had been designed to release. Not a structural failure. A trap.
He looked at his right arm. The sleeve had done what it was built to do, roughly and barely and at considerable cost to the arm it was attached to. He pressed the node once. A vine extended, hung, retracted. Still working.
He ate nothing. He had the water pouch and he drank from it and lay back and watched the grey ceiling of the cavern above and waited until the shoulder pain had degraded from sharp to something he could move through.
Then he got up, gave the gap in the floor a wide berth along the right edge of the bridge, and kept walking.