Cabin one

The paintballs splat harmlessly against the wall against the walls of the cube. The entire point of the cube is the walls, so he doesn't fall.

This luckily doesn't interfere with future actions, except he will be more careful about flag traps and inform the others about them when he next sees them.

If Timmy sees Spike and Wolf and ESPECIALLY if she sees him, an invisible psychic wall may silently form between them, effectively cutting her off from the rest of the cabin.