Doom: Memento Mori map09 NM secrets in 10:41 (first ever)

I'm glad I finally got around to trying this. At first, it seemed quite difficult, but with a little practice, I found the hardest parts became manageable. The hardest parts are the right side teleport, getting past the large groups of respawning imps and shotgunners, and also the ending. I took a bit too much damage before the ending, but somehow I didn't have too much trouble with respawning monsters there. Part of my method is that I don't fire a weapon where the three barons could wake up. They are in front of some repeat use teleporter lines, while every other monster that teleports to the ending uses a walk once line. Therefore, those barons respawn and don't move, while the other monsters can't teleport again, making the ending much calmer.