The guys replying to this about age are idiots. Your brother was cheated and I hope the person who did it gets a quick and well deserved ban. After starting a boss in the raids or after finishing the 5th round in PoE, kicking of fire team members should be disabled. If somebody on hard crota or something wasn't doing their job then you could wipe and kick them before getting on crystal. Same with Atheon by doing it before he spawns. But once that boss fight is initiated it should be disabled for this exact reason. In PoE it should be disabled in general. There's no reason you should be kicked when you did the work. Even if the kid was less than 13 or something, he did the fight and therefore deserves his rewards for doing so.