Re: OOC 2
Depending on how they are wired up, and the source of their powers, I could see this happening. The tech would be alien relative to this world, though. In essence, if the powers they have are psychic or mentally generated, they could be transferred intelligences.
Bear in mind, they wouldn't be playing by our rules if they had this. This is almost Mechaniloid, Splugorth, or Phyrexian levels of tech, where the line between machine and flesh become blurry. It has some rather serious implications.
For simpler solutions, I suspect that Snowblind might simply be immune to environmental conditions in some way, especially if he's wearing a suit, or something is making him full environmental in some way. Phantasma likely isn't there - if I were an illusionist, the last thing I'd do is put myself in the front.
Then again, they might be crazy enough to do that. If either of them are wearing a helmet of some kind, crack it, then encourage them to breathe in that fresh air. You don't even need to destroy it - just breach the integrity.