The lab was Tony's natural habitat.
Within fifteen minutes of walking through the door, he had rearranged the workstations to his liking, overridden two of SHIELD's security protocols that were slowing down his processing speed, and connected his own systems to the Helicarrier's network through a backdoor that SHIELD's technicians had not known existed and would not be happy to learn about.
Banner worked beside him with the quiet, focused calm of a man who was used to sharing lab space with volatile things.
The Scepter sat in a heavy containment cradle between their stations, its blue gem pulsing with a slow, steady rhythm that cast cold light across their faces.
"There's an emission," Banner said, scrolling through cascading spectral data on his display. "Psychic in nature. It's broadcasting on a frequency that corresponds directly to human neural activity."
"The mind-control function?" Tony asked, not looking away from his own screens.
"No, that's targeted. Direct contact required. This is ambient. Passive. Like background radiation, but for emotions." Banner adjusted his glasses. "It's making everyone on this ship slightly more agitated than they would normally be. Not enough to notice. Just enough to erode judgment over time."
Tony finally looked over at the golden Scepter. The blue gem pulsed. Steady. Unblinking. Patient.
"So we can take an educated guess at Loki's grand plan," Tony surmised. "That little theatrical speech in the plaza earlier was just the opening move. He wants us trapped in a metal box. He expects us to argue. He expects the Scepter's ambient radiation to push you right over the edge, release the Big Guy, and wreck this ship from the inside out. Break the Avengers before the team ever actually fights."
"That should be his plan," Banner said. His voice was perfectly calm. "But it's not going to work."
"You sound very certain about that, Doctor."
"I am." Banner didn't look up from his work. "There is no emotional trigger between us anymore. When the Hulk wants to come out, we decide it together. It doesn't matter how angry, frightened, or artificially agitated we get. This ambient influence isn't going to change that."
"I didn't think that was possible." Tony pulled up Banner's old SHIELD files on a side screen. "Reading these, I assumed Arthur had rigged you up with some kind of magical artefact to keep things stable."
Banner shook his head. "Mr. Hayes is a do-it-yourself kind of person. He never gives you the easy solution. He gives you direction, and if you follow it, you can fix your own problems. The hard work is always yours."
"That's his move," Tony said, a note of rueful recognition in his voice. "He gives you an idea and some vague, infuriating hints, and you're forced to do all the heavy lifting. When he could have done the same thing with a snap of his fingers."
"Yes."
They returned to the Scepter analysis. The work was absorbing, the kind of deep-focus problem-solving that both of them lived for. For several minutes, the only sounds were the hum of equipment and the soft click of data being sorted and filed.
"The emission is increasing," Banner noted, checking his instruments. "Slowly but steadily. We've been in proximity for forty minutes and it's up six percent from baseline."
Tony glanced at the readings. "JARVIS, monitor my cortisol and adrenaline levels. Flag any anomalous spikes."
"Already monitoring, Sir. Your cortisol is elevated eleven percent above baseline. Dr. Banner's readings are similar."
"We should work in shifts," Banner said. "Limit exposure time."
"Noted." Tony pulled up a complex new set of calculations on his main screen, his eyes narrowing. "And while we're at it, we figure out exactly how to weaponize this frequency. We find a way to turn the psychic manipulation outward. Use it against the alien army we're about to fight."
Banner looked at him. A slow, appreciative smile crossed his face. "I like the way you think, Stark."
—
The argument started with the rifle.
Steve walked into the lab carrying the Phase Two weapon and set it on the table between Tony and Banner. The thud silenced both of them mid-sentence.
"Look what I found."
Tony looked at the weapon. Looked at Steve. His expression was unreadable behind the glasses he had been wearing in the lab.
"Phase Two prototype," Tony said. Not surprised. Not shocked. Merely stating a boring fact.
"You knew about this."
"Of course I knew. Two years ago. When I casually hacked into SHIELD's most encrypted mainframes." Tony pulled up a holographic display showing weapons schematics, budget allocations, and testing data. "SHIELD has been developing energy weapons using the Tesseract's residual signature for years. Funded by the World Security Council. Authorised by Fury."
Steve stared at him. "You knew this and you didn't tell me?"
"I didn't think it was important. It's business as usual."
"Business as usual?" Steve's voice was flat. "That's a Hydra weapon. I fought a war against people who built weapons exactly like that."
"It's not a Hydra weapon. It's a SHIELD weapon built on Hydra research. There's a technical difference."
"Is there?"
Fury walked in. He saw the rifle on the table. He saw the holographic display. He saw Steve's expression and Tony's expression and the rising tension.
"I can explain," Fury said.
"Please do," Steve challenged.
Thor entered behind Fury, filling the doorway with his broad frame. He took one look at the room, at the faces, at the weapon on the table, and understood immediately what was happening.
"You were building weapons," Thor said to Fury. "Using the cosmic energy from the Tesseract."
"Using the energy from a fake Tesseract," Tony corrected, without looking away from Fury. "A fake that Arthur gave to Fury. Which means Arthur knew about this programme and didn't consider it worth stopping."
Fury's jaw tightened. "The world is filling up with people who can't be matched. Who can't be controlled."
"And you think building weapons in secret is the answer?" Steve asked.
"It's not about control. It's about deterrence." Fury looked at each of them in turn. His voice carried the weight of decisions made in rooms where the stakes were measured in millions of lives. "A couple of years ago, a god fell from the sky in New Mexico and leveled a town. We learned the hard way that there are beings out there who are more advanced than us by millennia. Beings who can invade and enslave us whenever they choose. The Security Council demanded we prepare a defense. Phase Two was their answer."
"Weapons of mass destruction as a deterrent," Banner said quietly from across the lab. He had not moved from his station. His hands rested flat on the console.
"Yes."
Steve stepped forward. "Last time I checked, the people building weapons based on Hydra technology were the bad guys."
"The last time you checked the world was 1945, Captain. The world has changed."
"The core principle hasn't."
"Moral principles do not stop an invading alien army, Rogers."
"Neither do secret weapons programs that nobody in the free world agreed to."
The room crackled with tension. The Scepter, sitting in its cradle three meters away, pulsed. Its rhythm had quickened. Banner noticed. His instruments showed the emission climbing. He pressed his hands flatter against the cold metal table, closing his eyes for a second.
"Here's what I don't understand," Tony said.
His voice had shifted. Sharper now. The casual deflection was gone.
"You had Arthur Hayes. The most powerful person on this planet by a factor of ten. A man who can portal to Asgard for lunch and fight cosmic threats before dinner. And instead of trusting that, instead of working with the man you actually had, you spent billions of dollars building weapons with something as dangerous as the Tesseract."
"Arthur is not an asset I control," Fury stated simply.
"And I am? Nobody controls Arthur. That's the entire point. He's a free agent who has been quietly making the world safer for a decade while you and the Council played your shadow games." Tony's voice rose. The Scepter pulsed faster. "These weapons aren't for the aliens, are they, Fury? They're a deterrent against him."
"They are not aimed at Arthur," Fury said. The words came out harder than he intended. The Scepter pushed on every crack. "Arthur is my friend, Stark. He gave me back my eye. He saved SHIELD from Hydra. He put a pendant around my neck that stopped a god from enslaving my mind. I trust him. But Arthur is one man. One human being carrying more power than anyone should carry alone. And today, right now, that one man is not here. He is gone. And we have nothing."
"So your brilliant answer is building the exact weapons that caused the cosmic trouble we are in right now?"
"My answer is making sure this planet can survive without him. Arthur could be wrong one day. He could make a mistake. He could simply not show up, exactly like today. And when that happens, seven billion people cannot be left standing in the dark with nothing but gratitude and good memories."
"Arthur has never been wrong."
"Arthur has never been wrong yet." Fury held Tony's stare. "I have spent thirty years watching good men with good intentions make catastrophic mistakes because they were certain they were right. I will not gamble this planet's survival on any one person. Not even Arthur. That is not distrust. That is my job."
"No," Tony said. "Your job is protecting this planet. Arthur's presence alone keeps the worst elements of this world in check. Arthur built the shield that protects this planet even while he's away. And instead of building alongside him, instead of talking to him about your fears like a friend would, you build weapons to counter him." Tony's voice was tight. "That's not contingency planning, Fury. That's a betrayal of trust dressed up as policy."
Fury's jaw tightened. The Scepter hummed between them. He could feel the irrational edge in his own voice, the way each word came out with more force than he intended, but he could not quite stop it.
"You are letting your personal loyalty cloud your objective judgment, Stark."
"And you're letting your obsessive paranoia cloud yours."
Neither angry man blinked.
Between them, sitting innocently in its heavy containment cradle, the Scepter's blue gem pulsed with quiet, patient victory, greedily feeding on the fracture it had created.