Sergio throws his left in a similar way, especially when he gets in close to his opponents. Watch the first round of the Williams rematch when he gets Williams against the ropes and unloads on him. I guess turning your whole arm over brings the shoulders into play more and allows for greater power at close range, but it does look very awkward and tiring.
Katsides was throwing perfectly normal looking right hands on the outside, so it's not a technical flaw.
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