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I agree with some of your post about Flankers having an effect on scrums ... Just watch a warratards scrum from the weekend.. My wife was commenting on how the Saffas have been doing a dirty on scrums in NZ were they pull back for a millisec then push causing the scrum to collapse ... So watch Potgetuir doing a great job by pulling the prop back and then pushing him back to make the scrum collapse..
was amazing to watch, the camera was side on and right there. and they showed a replay of it in slow motion..