[It seems John can't decide if he wants to hide his face in his palms or raise his hands in flustered despair, so he sort of settles for a mix of the two. One hand covers his face while the other gives a frustrated wave.]

I said I wasn't familiar with how polyjuice works! Some of us mere mortals do struggle in potions sometimes, you know! And can we please just pretend you never even said that other thing you just said?