What's blown out from the thin tube is a transparent bubble, at first only as big as a human head, then it swells to the size of a vehicle, then a house, and finally large enough to cover an entire building.
This isn't an ordinary bubble, but more like a layer of defensive barrier. Rising from the ground, it locks itself in the middle of the street, temporarily pushing away the thick fog that circles around.
Once the bubble is big enough to fit steadily among several tall buildings, Young Master Mo yanks and flicks the thin tube, then starts blowing smaller bubbles along the big bubble's edge.
Calling them small bubbles is misleading; each is still two or three meters wide. When Xu Huo and Scarred Glasses, locked in combat, rush into the big bubble, the little bubbles floating aimlessly inside suddenly behave as if alive, shooting straight toward the two of them!
