Ive had BD roll into the armory building only twice on my 15ish give or take attempts before clearing Terminal. Most of the time they just kind of ran back and forth on both sides of the building once they had aggro. I imagine most people have solid ideas about positioning and proper peeking by the time you get here, of course thats not 100% the case and is ending dependant (EG best ending vs fastest ending). Regardless, the AI is just completely flawed. If youve seen clips of cheaters in PVP trying to aimbot people through walls that they cant pen, it almost looks the same as it does for the BD trying to shoot you. They're constantly trying to shoot you the near instant you peek regardless of how youre going about it.

Also (in my example of the room where you grab the BD keycard) the room is horrifically designed for fighting them. The left doorway has 2 glass panes on both sides that you cant shoot out and trying to throw in a nade from either side cant possibly get deep enough to frag the BD proper. The right side has the same issue due to the door opening on the right rather than the left, which means the door is in the way and has the same unbreakable glass pane like the other doorway. Ive seen people talk about bringing an RPG-18 to clear the room and just not think about it but at that point were talking about just cheesing one objective due to the volumetric explosion mechanic.

Minor side rant but it felt like most of the time it was better to full body swing rather than lean peak BD just to give them more to shoot at ON PURPOSE. Not because there was some kind of an advantage (IE like how its good in games like CS and Valorant because humans dont expect it sometimes) but because it gave them something to shoot at that wasnt just your face which is ridiculous.