[He knows that too -- so unfortunately, he's more than prepared for that as he falls back with her lunge to force the pursuit, seeing as he's incapable of teleporting in his current state -- but that's fine. He's in a small space. She can't do much in the way of surprising him from behind, which had been what he was most concerned about in the first place.
As PM's strike follows through, Jack drops his sword to grab her wrist as he sidesteps the lunge, using his own momentum to try and bite her at the throat before she can sink her teeth into him.]