Well.. I really tried to fast play the first mission and on high chaos as I couldn't find a descent way to knock out butchers or how to counter attack them (I know that they have that thing on their back but it takes more than 1 bullet and by then it's too late). I have finished the dlc on high chaos because I couldn't do a stealth approach on them and of course I missed many things trying to avoid them so the next time I play it I would like to have an advantage . Many times I ended up running, shooting 294843 bullets and arrows and in the end I shot them with explosive arrows or placed a mine in front of the stairs while I was hidden under them. I could really use a few pointers as to how I can a) knock them out or put them to sleep (sleeping darts didn't seem to take) and kill them with as less resources as possible. Maybe I accidentally hit them where they have their armor? Dunno..

Anyway, any help is much appreciated