Couldn't he have, you know, drank the water that was building up?
Without gravity, water floats in bubbles you can't easily blow out of the way and the surface tension can keep the film intact over your nose & mouth if their is enough. If you inhale a bubble, all you have is the force of your breath to blow it out. You can easily imagine a scenario where you run out of air in your lungs as the bubbles keep floating in front of your face in the helmet. Scary is putting it mildly.