South Dakota is running from her own monsters - hulking armored humanoids; slow, but powerful. South herself is in a panic mode, shaken from the visions and the whispers. She's not expecting to run into anyone else, so there's a moment when she slides into the corridor where Sombra is pinned, she pauses out of confusion. When some of Sombra's own monsters focus on South, however, she doesn't hesitate to engage, firing her guns and kicking out.

"What the -- fuck?!" She finally notices Sombra, and gives her a tilt of the helmet.