And singing carols.

Probably meth if I were to bet. It's not so much that this guy was super human in strength, it's that he couldn't feel pain, either due to lactic acid buildup or due to injury. Being in that kind of state it renders an individual only possible to take down by actual crippling physical damage. Punches hurt, and broken bones hurt, but you can physically keep moving and keep fighting for quite a long time after suffering blunt force trauma. To put a guy like that down sharp implements will do the job quickly or smashing the skull in or bullets. But beating a guy to death can take quite a while.

I wish but Bitchute's slow ass player won't let me.