(to Killua) When someone is in pain,there eyes show a gleam of hostility toward the one responsible for that pain. Even with extensive training, it is difficult to suppress the gleam of hate and rage. But there was no gleam in Gon’s eyes. Can you believe it? I had just broken his arm. But his eyes had already forgotten about that.
Hunter X Hunter 2011 episode 21, Some X Brother X Trouble