I can't believe this actually worked!
Context: I did early Dancer in NG for the first time, and was struggling with Dragonslayer Armour. It seemed like my deep battle axe wasn't doing much damage, so I looked up his resistances only to find that he resists both slash and dark. But, he's weak to frost, and there's a Boreal Outrider in the basement near the area where the dragons were. I've never used a frost weapon before, but I've heard high praise for some of them, so I decided to try to get it.
Problem: Outrider knights destroy me on a good day, and I'm severely underleveled, so my chances in a straight fight are basically zero. Even if I tried to abuse magic, my only real options are soul arrow and the basic fireball (and I can't even upgrade my pyro hand), so things were not looking good. It was then that I remembered that Pus of Man can damage other enemies. There are two of them in a pit nearby, with two ledges above the pit. The walkaround from the pit to the ledge is considerable, so if you are on the ledge, the enemies' pathfinding will only attempt to run straight at you. In theory, if I could lure the Outrider into the pit, and flee fast enough for it not to follow me out, I could safely bait the Pus of Man into killing it for me from the ledge.
The plan seemed absurd and desperate, but turned out to be shockingly effective. It seems Pus of Man depletes a minimum percentage of health in a friendly-fire situation, as it absolutely demolished the Outrider, despite their high HP. I couldn't help but laugh maniacally at the sight of it. Has anyone else tried something like this before?