That's what I thought too initially. The video replay clearly shows Royce threw 2 knees. 1st was definitely a (now illegal) groin shot then a few seconds later a head shot. Shamrock felt them both, was stunned and Royce body locked and tripped him. The fight shouldn't have been stopped either with hammer fists. Unfortunately, the ref did not see the 1st knee to the groin cause Shamrock didn't react initially. Suck ass ending. Royce looked sharp and pretty quick for a 50yr old.