Ooooooooh. Wrong answer!
Glenn's argument is fine. Remember that "causes" just means "raises the likelyhood of." He's shown that people who dance are five times as likely to have knobby knees as people who don't dance, which is enough to show dancing causes knobby knees, provided we have no reason to think the studies didn't show that, or they weren't properly conducted, or that there might be a common cause, or something else that would be relevant.
Savannah doesn't give us reason to think that there's anything wrong with the studies. Instead she mentions the fact that not every dancer in the studies got knobby knees. But Glenn doesn't have to show that every dancer gets knobby knees. He just has to show that more dancers than non-dancers get knobby knees, and he's shown that. So Savannah commits the Red Herring fallacy.
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