I'm just about to give up on DF's Brutal Mode. I've been in the "blue room" and damn this mode is fucking horrid. Two shots and you're dead. You just spend hours on single shootouts and get flanked by one lone enemy when you think you're safe. Stop this bullshit of turning good games into Dark Souls, please.
Do the glitch. Run all the way back to the courtyard, shoot the machine gun turret, wait until music gets tense then go back to the room but don't drop down. You'll see the enemies already spawning there. Now shoot them from the safety of your alcove above. Har har har.
I agree with the bolded though. It makes the game not fun even on Normal and I completed Crushing.