What would your reaction be if your boyfriend hit someone in the face?

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Early this afternoon when I fetch my boyfriend from school. While he was playing WOW he got annoyed with someone who is also playing who is always shouting every time he talked. He once asked him to shut up but instead of listening to him he asked my boyfriend to hit him. My boyfriend got really pissed off and he hit him right in the face right at that moment. I was kind of shock but little satisfied. I was really annoyed by that guy too. I was surprised by my reaction because I was supposed to stop my boyfriend but i didn't. I want him to hit that guy more. LOlz. But I felt really bad because I was not able to hit that guy with my own fist or even just give me him a kick.