Run clockwise around the arena to keep away from skolas until you're ready. Know all three of you can shoot at him when you're about to kill the ghostly servitor so you do t waste time looking for him. Then kill all the smallish enemies you can until your next servitor/skolas phase. Stay close during the poison round and communicate what the timer is at. Take the poison when it's at 5-9 seconds left if possible. Keep some heavy ammo for when you have to dismantle mines and use it liberally to thin out the enemies rather than die. Communicating clearly is most important.