It's not his fault that Miss Jessel intruded without his permission, he says, but it's her fault that she hit him so hard. It'll take a long time for his body to heal from this kind of treatment, he explains. He's glad that he's able to use paradox to his advantage now, because he can use it even more now that he has more strength. Oh, of course, she sees him as weaker than he was back then.