The moment the big guy fell, it was pretty much over. When you're near 400lb, even something as simple as getting out of bed is difficult; much less trying to get back up while a boxer is pummeling you.
@Burning Bridge Studios. yeah strongman are usually tough motherfuckers, this guy was just a fat fuck tbh he was wayyy too fat, there is a limit to bulking up to lift your one rep max at deadlift
This is the UCMMA, based in London and this fight is old. The whole "punches to the back of the head" thing is a Boxing rule forced on American MMA associations that wanted licensing in Nevada or California. It was made part of the "universal rules of MMA" in 2009 but not enforced until recently and even then, only in American MMA associations.