I dont believe thats when he tore it. When Bigfoot went to clinch him, Browne threw a knee of of it. After the clinch eventually broke (following knees to that leg by Bigfoot), Browne could barley walk. If his leg had already been fully injured before that, there is no chance an a guy could throw a knee of that leg before his adrenaline was pumping. I think either the knee or Bigfoot's clinch strikes did the damage.
Thanks to Ape for the sig.