Re: Surely it'd be easier....
There is a drain valve. The helmet is under pressure, and space isn't. So it should work.
Luca Parmitano said in an interview that the drain valve was his final option. Without gravity, the surface tension of the water is much more powerful. And so it sticks to you like some sort of jelly. The water had covered his eyes and ears. I believe his radio was still working, so NASA could hear him calmly saying he was about to drown. But he couldn't hear them, so didn't know if help was on the way - or the radio was bust.
So he worked his way back to the airlock blind. But couldn't see to operate it. He waited there for help. He'd had to climb over an antenna, and the other astronaut had to go a different route, so they had places to tether their cables.
I think in climbing over the antenna he'd changed orientation, and the water had started to cover his nostrils.
So he waited, in the dark, in a failing spacesuit, with no comminications. He said his plan was to open the dump valve from his helmet. His hope was that even if he blacked out from lack of oxygen and couldn't close it again, the water in the helmet might freeze and form a plug, giving the air time to refill and him to regain consciousness. But help arrived to get him into the airlock, and he didn't have to try it.
That man has the Right Stuff. As well as extemely large brass ones.
His reward? Another mission. Involving some complex maintenance, to be done in several long spacewalks. Which needed 100 hours practice submerged in a water tank to train for...