This is a safe assumption to make. Gary slumps against Nitou's side as his legs crumple underneath him, too numb to hold him upright. There's also quite a lot of rather unpleasant shuddering going on, which--oh. He's laughing. Trying to laugh.

"The...it's the stuff from the..." Gary points in the vague direction of the vents, as if this is the most obvious thing in the world. "...You know? Right?"

No, Nitou was there and the gas did not break his arm or ribs. Gary is obviously delirious. He deteriorates into a fit of wheezing coughs before he can continue babbling in a similar fashion.