Kallen's quick step was enough to get her out of the path of her immediate target's shot. Clearly, however, it wasn't going to be enough. Fortunately, she had more tactics handy.

Spotting Batman's toss, she quickly flash-stepped to a few paces behind him, slamming that guard's head against the wall with her claw. If one strike wasn't enough, as she'd just seen, perhaps two would work - especially since she was slamming it against the wall.