How dpes wiesel react when his father is slapped by the gypsy?

In the book "Night," there was a part when Wiesel's father was slapped by gypsy. Having witnessed such violence, Wiesel did not do anything. He stood there and kept silent. He was shocked and petrified with what had happened. That was his reaction.

Wiesel is shocked by his reaction to his father being struck with such force that he is knocked down.

Wiesel says, "I stood petrified. What had happened to me?" While the violence of the slap from the Gypsy scares him, his lack of action surprises him even more. He thinks that if his father had been struck before they were moved from Sighet, he would attack the person. He says he "would have dug [his] nails into this criminal's flesh." This event shows how the imprisonment and the abuse the Jews faced in the camps changed them. This event can also be used to show why the Jews were too afraid to revolt while in the camps.