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Man that gif of that exchange.... did he even land a single shot?
To this day, I believe that Werdum faked the knockdown so that he could catch Fedor in the triangle like he did.
He didn't fall down on purpose. He was off balance dodging punches.
But it did work in his favor.
the first shot fedor threw landed square on his jaw, Werdum fell forward possibly rocked and was off balance, from there he fell backwards and the rest is history