If you have 2 controllers my suggestion is to do this split-screen on the first level "Pilar of Autumn".
Sign in your main account as player one and use a second account/guest as player 2. Run through the entire mission with player 2 leaving your main account stationary the entire level. It's a great way to net OVERSHIELDS ARE FOR SISSIES, WALK IT OFF, FEET FIRMLY PLANTED and HE'S UNSTOPPABLE with zero risk.
Happy hunting!