Well, in that 2s fight you went for the feral. Then switched to me for 2 sec, then went god mode and oneshotted the druid in 1 global or something. He is Close to being full grievous geared, probably missing 5-6 pieces. And that was only With 2 shamans, can just imagine the burst With 4. But Yeah, guessing you would need to clean the kill target first, and switch like a maniac.