It was then that Hook bit him.

Not the pain of this but its unfairness was what dazed Peter.
It made him quite helpless. He could only stare, horrified.
Every child is affected thus the first time he is treated
unfairly. All he thinks he has a right to when he comes to you
to be yours is fairness. After you have been unfair to him he
will love you again, but will never afterwards be quite the same
boy. No one ever gets over the first unfairness; no one except
Peter. He often met it, but he always forgot it. I suppose that
was the real difference between him and all the rest.

So when he met it now it was like the first time; and he could
just stare, helpless. Twice the iron hand clawed him.