Nope, Black Rock Shooter's an aggressive fighter who has no qualms about trying to go for the kill against foes she's specifically not trying to keep alive.
... And it wasn't your decision to make. You don't have to let her plan succeed even if the pushing him away would probably work. He could back off or something.
Ok then, I'll edit out the part where she disappears and just have it end with the explosion
Is that fine?