Depends whether or not the Berserkers get to him, and begin more rip and tear. Impaled is bad, but he could probably keep fighting, because really, that's how Astartes work, taking this kind of punishment, and keep on trucking. Right now, Santana is basically trying to kill the berserkers so he can get the hell out, and try to treat his injuries.
What Victus is probably going to really need is a way to get out of the armoury. I doubt the Berzerkers and the Terminators are just going to let him walk out with a lot of military grade explosives whether he has a disguise or not. Though maybe if he kills a Terminator the ship's astropath on the bridge could use the dead Terminator's teleport homer to get Victus up to the bridge. The problem is that the only way I could think of doing this is if Victus just held onto the corpse for dear life and hope that he gets teleported with it. It would also mean he wouldn't be able to use a melta bomb or demolition charges (or a similarly destructive device) to kill a Terminator for fear of destroying the homer.
The big flaw in this if he can kill a Chaos Terminator with more or less what he currently has plan... if.
If the bridge could lock onto the Terminator's teleporter homers, we could just warp them out into the void. Might want to work on another escape plan.
The problem is that, when it comes to leaving the armoury... I got nothing. Guess I'll be hoping this Shadowseer's full power is really something. If not then at best Victus just blasts a wall open and runs with whatever he can carry on his way back to the lift he came down on. If the worst case scenario happens and there is no possible way out then... well, adios muchachos. As you may have noticed Victus' plans have a very all or nothing thing going for them. If it works it goes really well but if it goes wrong then almost everyone involved will likely die horribly, if not everyone.
I really enjoy reading @BruticusTheGoreHound posts. Posts like that were what inspired me to RP in first place back in the day.
Oh, thank you very much, always nice to have good people to inspire me to post what I do. Glad you enjoy what I'm putting out.