And just seconds after her hits that floor, the door is kicked in hard, and Jack storms in.

"Here!" he shouts, and bears towards her. He's had time to think, and he reckons that if he wastes no time in putting the boot in, backing off, then hitting again, he can keep the body in pain and keep it from 'phasing'. At least until Sam gets here.

Contrary to appearances, he's not happy with having to beat up a pubescent girl.