Back on topic, considering the DLC coming out in the new year, it may shed some light on Gabriel turning into a vampire. I mean sure when he beats Satan, we see what appears to be light energy come out of Gabriel's mouth, but what was it exactly. Most people seem to think that it was his good half ascending to heaven leaving his dark side behind, but he still seems human until after the credits. Which means that either it takes time for the transformation to be complete or his good half didn't ascend. Who knows what actually happened? There's nothing to say one way or another. I've also heard a theory that it was just his light magic leaving him. Maybe, it's what happens when he goes back to the castle that changes him. I think that we just have to wait and see.