[Toph rolls her eyes and shows him her foot. It's not a big or even very noticeable scar, but there is a small scar on her foot, on the arch.]

You were trying to join up, remember? They sent you packing, I went to talk to you, you panicked, and then you burned my feet. Geez, did that time compression mess your brain up or something? I told a hundred times it was an accident and no big deal.