Where is this break-out going on? Are these the prisoners I captured, or some others? I may have just missed it, but I don't see anywhere where it explains where these guys are and what guards they're killing.
I am not quite sure, because Ciscero is played by Kaine.
But I would be willing to be it is the disgruntled stormtrooper who tried to escape from Carida in a technicians dummy TIE Advanced, and was captured. (Probably saved him from certain doom.)