This is what Benson and mmamaina said about his loss to RDA
It was a single punch that ko'd Benson though iirc, so I'm back at square one. I do believe he is referring to being ko'd very briefly though.
Mmamania:
The reality is there's very little time to make clear decision as the referee and John McCarthy, a veteran of the fight game, immediately jumped in when he saw Henderson lose consciousness. Even if that lasted all of one second, that's all the time it took to make the call.
Benson:
"It was a flash knockout. You know, they happen. You know, the flash knockout, I remember dropping my back in the fence and I was like 'oh, damn it, that didn't look good at all, that's a bad thing right there.' Wanted to latch on to a single leg, push him up against -- turn, you know -- push him up against the cage, hopefully take a couple shots back of the head, let the cobwebs clear a little bit, you know, take some time and then start working from there. But as soon as I start to come around and go on to the single leg, 'Big John' (McCarthy) did his job."