He doesn't quite come out and say it but he certainly implies that something fishy was going on. From the Fight Card radio show:
To be honest he was really slippery and I don’t mean that like technically-wise, he was really slippery. I don’t know, I don’t want to speculate and say that something was used or whatever but he was just hard to hang on to and that was from all the positions. Even when I had him in like a headlock or a guillotine everything was just really slippery. When I get the position, when I get mount, when I get back-mount, I’ve fought and I’ve wrestled some of the best guys on the ground from Brazilian Jiu-Jitsu and submission wrestling to MMA and when I get those positions you’re not getting out and Roger was able to get out. It was pretty slippery so I was a little surprised. Just the first time I was mounted on him and he gave his back I was a little suspicious, I knew something was up. Who knows, all I know is I’m good at keeping those positions and I know the difference between sweat and something else and it felt like something else but who knows. (Jokingly) Maybe it’s Albolene left over from the day before from the weight cut!
HT MMA Mania