I said it before, if it gets tough for Reem, he usually wilts.
However, I still DESPISE the Bigfoot bully act. I hate it. He's used to being a 330 lb. monster and people cowering in front of his massive head.
I'm telling you, it was the clash of heads at the beginning of the round that did Reem in!
It looked like an almost immediate short right during the tie-up added to the damage but I did see the clash as well.
Overeem is a very effective striker but his combinations and approach are so easy to scout it's not even funny. A few years ago, I said his techniques were effective but amateur-ish and got BLASTED by some K-1 fans right after he won the GP. Watch him, though. It's usually a couple of wide/wading in punches followed by a tie-up and a couple of knees to the body and a few wide punches to the covered head.