Due to the new update, apparently it's possible to be able to pick up the headtaker as a usual melee weapon for the demoman. I came across one of my friends doing it after HHH death battle had finished. Had no clue how to handle this as I've never seen this before, but I consider it an exploit and had slayed him, which appears to have fixed the issue. However, this needs to get fixed as to avoid more senarios of people doing the same thing.