Of course! You don't hurt people I love. I avoid violence, but I'm not going to stand by why people I love are injured. I have jumped in for my brother and also a friend before. In these circumstances I feel it is ok to fight.
Violence is uneccessary! i would avoid a fight if i could and if one of my friends is involved in a fight first id try to stop it. if i see there is no way of stopping the other person , then il jump in and knock the day lights outta him!