What did Auggie lie about when questioned by Mr. Tushman and the camp director in the first-aid office?

Auggie told Mr. Tushman and the camp director that he couldn't remember the faces of the boys who attacked him. This was a lie.

I said I couldn't remember their faces at all, which wasn't true. It's their faces I kept seeing every time I closed my eyes to sleep. The look of totalbhorror on the girl's face when she first saw me. The way the kid with the flashlight, Eddie, looked at me as he talked to me, like he hated me.