The way that this works is the Chosen needs to have Guard and Hold the Line!. The Chosen guards the Marauder and then the Marauder pulls an entire group of up to 10(at level 12 and 14 which is where we are at) and then the Marauder gets behind the Chosen. Once this happens, the Chosen immediately pops Hold The Line! and the marauder AOEs the mobs down while taking little to no damage, and the Chosen takes no damage as well, since he is blocking or dodging 45% better.
Sorry for the wall of text, on a cell phone.