Here is Bob Sapp fighting James Thompson at SFL 1 which took place 3/11/12 in Mubai, India. As you can see, this is not a pretty fight. I posted it because of numerous requests of people wanting to know what happened.
I honestly don't know how Sapp reversed Thompson from the bottom. I don't know how Sapp's knee then got hurt. I have seen knee injuries occur in practice, and it really doesn't take much. Ugly fight to say the least.