Keeping the staff front and centre, your off hand builds a giant laser beam of it’s own up, firing out in short order and locking her laser into a gnarly wizard duel. Though her own laser had more chooch than yours did, you only needed it to shove it back for a couple of seconds: enough time for the staff to add it’s own giant death laser to the mix and start pushing back against her, the two beams converging into a single marbled death ray.