I am sorry if that will look rude, but i don't have other words to describe it. In last part of the (suposed to be hard?) mission 4 people advancing in group. If antagonist shows up - he just getting devastated with 4 guns. And then they just sit behind the turrent, and not a single mob can approach them, and, of course, antagonists dies without any chances to approach at least for the middle-range (rifles) combat, because turret devastating him in seconds, and there is no way around it. Basicly only sniper can do anything on that map, but concidering that he will be always counter-sniped, that is hardly an option too and leads to a very boring gameplay when only one character can even hope for to do any damage at all. That was a problem in previous missions, but now it's even worse.
Also it's not helping at all that Antagonists spawns without new ammo. It's already imossible to approach Lycus if he bought oneshotting cheatgun, that does not need aiming at all and always if not instakills - then putting into wounded state, so when he covers the team - there is no way to refill the ammo. But even without him jumping into melee with more than one person is a 100% suicide because of the grapple.
Basicly you can't shoot, you can't refill ammo, you can't melee. That is not even unballanced - it's simply broken and needs HUGE rework in everything, starting from refilling ammo upon dying and ending on level design changes before it can be called at least playable, if not ballanced.
p.s. Did i meantioned that protector's shield also regenerates his hp to full every time it applied? What is that? You must destory him in one attempt?