The three powerful C-rank fighters made their presence known almost immediately. Their large size and overwhelming strength allowed them to cut down scores of the rampaging monsters, acting liking personal bunkers. Those that weren't cut down were forced to split apart, branching out to the sides leading them towards the bunkers.
Such tactics were only possible due to the strength of Frost's forces and the strategically placed and well built positions of the bunkers. The secondary defence zone worked exactly as planned, easily dividing up the large wave into smaller more manageable chunks. Though it took a little longer to deal with them the damage to the bunkers and their forces were minimal.