Me and a few friends are in Blackrock Stadium in Blackrock Mountain. And the part where all the trash spawns and you have to kill it and then the boss jumps down and we have to fight him, the boss is not jumping down and we've all been sitting here waiting for about 10 minutes or so now. Is it bugged, or did we kill the trash too fast?
It is quite possible that you killed everything too quickly. In order for certain gauntlet-type events to register the player, the mobs have to naturally aggro onto you. If you pull them as they spawn, it can bug the event out.