I don't really know the reasons, he posted on our guild forums why he left but they don't make much sense. Basically the next day he said he regretted it and he admitted it was a stupid thing to do and was trying to find a way to con blizzard to letting him transfer back lol. From what I gather some chick he liked left Cho'gall and went to BH so he transferred to be with her but I don't know if that's true or not. He left just a few days after he won Severance too go figure
Oh yeah and he came online on an alt one day and asked if anyone knew you but I didn't get to ask him why he asked, you know what he's talking about?