One consideration for Sarah is that the Sergeant has the same last name as Wing Commander En.  He's a little too young to be her father (who was a storm trooper who disappeared on a secret mission when she was very young) but he might still be an uncle or perhaps a brother.<br/><br/>A sentinel assault would definitely be a good plan though.  Infiltration isn't possible without a distraction, since there are too many eyes trained on the door to the corridor.  Multilasers and autocannons have enough firepower to negate some of the cover the mutants have, though flanking would be even stronger