the old PLD OT has no clue what to do situation.

Tell the PLD that if he is going to OT that he should be applying the RoH debuff only when its about to go off its timer. Then, he should be riot blading, Stoneskinning, and god forbid using COVER. Foresight + Cover is a pretty solid CD to pop on the MT. pop it with Bulwark if you need to as well.