I saw the replay again when Williams got punched in the side of his head and it caused his head to spin to the left and he went limp and his face planted in the ground.
I do t see him face planting if he doesn't get punched.
The fact that the NFL and other players ignore the pinch the NFL would rather sweep it under the rug than publicly admit it happened than call out the refs for helping the forty Niners win the game.