What is it so hard to understand that he had zero lateral movement in that knee, there was zero stability. Forward and backward movement is no problem, its the side to side that was impossible, and a QB is all side to side, think of him taking the snap and dropping back in the pocket.
Stand up in the squat position and think of moving your weight right, and having no ligament to hold that pressure on the outer part of your right knee. You would fall over.
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