She sees the flash of some sort of energy discharge, and peeks around the pillar, mentally cursing herself for arming someone with such terrible trigger discipline, and who does not take direction. The latter abates a little when she sees the two corpses in a spreading pool of blood - but not entirely.

The shield surrounding the female Sylphid doesn't look like the kind she's seen Steven throw up in practice, or the barriers she's seen a handful of the more practiced mages amongst the native rebels use. Which means it's probably a Heba talent - which means it's almost certainly bi-directional.

"Get back," she hisses, banking on the pounding on the door and the ringing echo of gunfire to keep the guard from hearing. "She's going to have to drop that shield to shoot. That's our opening."