Yes the glitch is their fault, but that doesn't mean that it can just be abused and then all wrong doing expunged because you claim it's their fault for,it being there. As a player of their game it is bound to happen that you will run into these, but it is your duty to report the issue and then strive to ENJOY THE BLAMING GAME. Designers spent months on this,specific,fight. From the artwork to the mechanics to the enemy pathing and damage mechanics and you consciously are deciding to tell them to go shove it and that all you care about is getting the gun at end and being able to brag that your 32 to all your online forum friends.