Whilst Vega just about noticed them, he couldn't move quick enough to dodge when they fired. He wasn't sure where he'd been hit, the adrenaline masking the pain well enough for him to vault over a low wall and deck another alien before he collapsed.
"Shit!" There was blood. Old school weapons sure made a lot of it, didn't they? Wasn't like they had any medi-gel to hand either. "Hey, uh, Commander? I've gotta sit this one out!"
Maybe if he stayed still enough they'd ignore him. He could live in hope.