I was on a heroic where you farm so many troops then you kill a boss, I spent a few minutes farming and summoned the boss and about 5 seconds into the fight this player jumps in starts attacking, gets credit for the kill and I can't complete my quest. So you can summon a boss, tag the boss, start damaging it then random players can just jump in an steal a kill from you and grief you that way making you have to redo an entire heroic? Really????