Okay, then do you stop fights every single time a fighter in danger commits a foul? Because that's fucking retarded logic.
The man was still in danger, but clearly conscious, he didn't get back to his feet with a 265 lb man on his back punching his head in merely by grabbing the fence, that's just silly.
My position is -- Allow Lewis to continue to land against a stunned opponent(who was clearly recovering), grant him a dominant position and deduct a point when it was clear he had recovered, which seemed imminent.
That sounds significantly superior to prematurely ending a fight because a foul was committed.