I've watched this video a lot. I don't want to say 100 times, but it's getting close and I'm still not really sure what happened here. In real time, it looks like Jiwan James of the Reading Phillies pulls off some sleight of hand act: his running, jumping, crashing catch has us all tracking the ball and following the glove as it disappears over the fence and then out of nowhere "hey, look at that! The ball's right here in my right hand."
On closer inspection, though, it looks like James gets some leather on it and then the ball sort of tumbles down with James and he secures it with his non-glove hand. Or maybe he pulled a fast one. In any event, where was this guy last week?