Strike 1, for me, was when the bully immediately saw shades JUST ONE DAY AFTER he got OP-d by the anvilhead spirit.
Strike 2 was when Zack decided to pull some Shyamalan bullshit and make Isaac an 8th grader out of nowhere - retroactively plotholing everything from setting (you're telling me all classes in the same grade share the same P.E session?! Where the hell was the rest of the 6th and 8th graders then all this while?) to dynamics (seniors don't treat their younger peers in the same club as "equal friends" - which was implied in early chapters - trust me).
Strike 3 was when she turned the Muslim™ doctor into a blubbering idiot and the plump agent into a giddy creep.
He is definitely not gonna resolve this chapter and call it quits, believe me.