I get the mirror part with volkov. But that doesn't explain his face and eye acting up. I mean the worms teleported into him? From where? From what? And I get the time travel thing and etc but they dropped us in the middle of aliens, the thing and Donnie Darko and just said fukk it alternate universe to explain what we don't see.
I assumed they were grabbing his eye and just holding it.. a couple scenes before that, he'd asked someone if his face looked weird. He probably could fell something slithering around inside his head. The worms were already on the ship, though for what I have no clue; one of 'em had asked where they went later on in the movie.