Ive been running through the arena up to killing bullseye like 6 times now and I just can't get it. I've avoided all names but for the weapon-based ones, and I've been very carefully tracking how many kills with each weapon. Two runs in a row Ive had exactly the same kills with sword and knife when I beat bullseye, and I made sure there were no secondary electroshock kills, and yet I get "savage mangler" each time, which is the knife name.
edit: ...unless it doesn't count as a weapon kill if the energy portion of the weapon does the kill?
edit 2: doesnt seem to be the case; did it again with no power in my weapons and this time I got chop