This doesn't feel familiar, exactly, but it is a tactical formation and so Vivi's hindbrain, such as it is, responds. His role is to keep firing and little more than that, so he plants his feet and keeps drawing energy out, dragging it from his surroundings and condensing it into power.

Gabriel forges ahead, no longer staying still, and he changes his tactics accordingly. Anything not within range of Gabriel's sweeping arc is bombarded with brilliant fire; the occasional straggler that manages to stumble forward after being cut with his swords doesn't get far. Vivi's eyes are wide in calculation, but it's a distant look, as if he's not really seeing what's in front of him and conscious thought is taking a back seat.

(Surely they have to run out at some point. He hopes so, anyway. It doesn't feel good to kill them, knowing they were mortal once, even though they're so far gone that destroying them is letting them rest in some modicum of peace...probably.)