Minions get locked out of boss fight, act 2 main boss

Minions don’t follow me into the boss arena for jamanra the abomination boss fight. Happens every time. I can’t do enough damage without them. The door needs to stay open a little longer or they need to teleport in. Boss impossible to fight without them if using a minion build. This includes the hell hound and the Npc that is supposed to protect you from the sand storm. If I try to walk slow to make sure they keep up, they all get stuck on the bridge leading up to the arena. I have 4 skeletons, a hell hound and the Npc, I’m on Xbox. This is game breaking because you have to keep stopping the fight and reloading at the checkpoint to try again. I’ve been dealing with this for 30 min and have only had the chance to fight the boss fairly 3 times. His minions are also too strong or too many during the sand storm, and there is no space to maneuver to actually target them, my spells consistently go the wrong direction.