Watch the end of the fight from the clips posted here at SB, and you will see Henderson finish Shogun with many back of the head punches. No calls mere made, but a;ll those punches looked pretty illegal to me.
Could things have gone different if he didn't do that? Probably not, but still.
I'd have to go back and watch other Henderson fights to see, but does he do this alot?
I'm sure they were not intentional, but still.