"Spoilers!

I died a lot when I fought against this "nightmare". Maybe because the time was 2:00 AM :) It's a bit tricky, if you injure somebody... you'll have a real nightmare. If you can fight face to face against one enemy, your task will much easier then. All in all, I liked the idea. (And that nasty achievement for this fight... grrrr :D)
Difficulty was Death March."