The gyspy striked him because he asked if he could go to toilet. Wiesel did nothing. He was shocked.
« I stood petrified. What had happened to me? My father had just been struck, in front of me, and I had not even blinked. I had watched and kept silent. Only yesterday, I would have dug my nails into this criminal's flesh. Had I changed that much? So fast? Remorse began to gnaw at me. All I could think was: I shall never forgive them for this. »
Hope this helps !
Nyway