[Cain knows he's a sitting duck if he just stands around gawking at the charge. His laspistol and chainsword are in his hands immediately. There's no standing and dueling here, though, as he doesn't stand a bloody chance. Moving along after Gaunt until they can get into some semblance of a formation is his best bet.]
[Turning tail and running isn't the wisest move, though, so he knows he's going to have to fight before he can feel some semblance of safety again.]