Apparently it's a strained right calf, so it doesn't sound too serious. It's one thing to have a little quirk in the outfield like keeping your glove closed or tapping your leg, but there is very little reason to simple hop when you're about to catch a routine fly ball. In any other player, I probably would have just let it go, but the fact that he's incredibly arrogant on every homerun he hits (billyhallfan provided an excellent example), that it makes me think that the hop has way more to do with ego then it does timing or quirkiness. While I'm on the HR subject, why is that guys like Soriano and Manny Ramirez can showboat and act cocky after homeruns (Soriano does a spin sometimes, throws the bat...Manny, well he just stands there at home plate until the ball leaves the yard and nothing seems to be said, but when Ryan Braun last year did a relatively minor thing by staring into his OWN dugout for a second or two, it became a huge issue about how cocky he is...and he wound up being beaned for it.