[x] Start laughing. It'll do some collateral damage to the glass in the area, but the combination of "unblockable, undodgeable attack", "glass-breaker", and "effectively deafen the temporarily blind girl" should be pretty helpful here.
[x] while laughing, get in close and start beating on her. Try to disarm, try to disable. No crippling or lethal blows. Once she's combat-ineffective, secure her. We should have some sort of reasonable restraints, right? Stop laughing once she's fully taken down. then call emergency services again and see if you get someone new.