User blog comment:Ghmorello/Chapter 887: Hot Pounding/@comment-24850639-20171201161847/@comment-24850639-20171201190917

I'm specifically referring to the Long Ring Long Land Arc, where Sanji and Zoro teamed up against the Foxy Pirates. They had a half giant/half fishman named Big Pan, and Sanji used an Anti-Manner Kick Course to kick him into standing up straight so Zoro could slam the ball on his head into the goal. Long Ring Long Land was the arc right before Water 7.

I was referring to that instance and Sanji's feats against Oars in Thriller Bark as separate occasions were Sanji demontstrated incredible leg strength. It was just a coincidence that Sanji happened to use that attack on Oars as well.