He couldn't move!
He grabbed on, found his footing, and got into position. But he couldn't flip him!
This made Yang Feng feel very awkward.
Yang Feng was aware of his nickname, the Iron Hero, and had watched the video of Meng Fan's fight as well. American style MMA fighting was very exciting to watch, but he could tell Meng Fan didn't have much skills. Even if he snuck up on him from behind, his strength would be powerful. Even if he didn't watch the video, Yang Feng would still be able to make that analysis.
But Yang Feng didn't think he'd be unflippable!
He just said Brazilian Jiu-jitsu favored those who were weak and flexible. This sentence wasn't even to brag, or used to compare. It was a generally accepted rule of the sport.
Strength wise, he knew he was nowhere near Meng Fan, since Meng Fan's figure already proved that to be true.