I'm assuming he's going to end up with a cast on the injured hand (his right hand is unharmed, solely because I need him to fire a gun a little later in the story), what I need to know is:
a) how long the cast would stay on for? I can waive this a bit if necessary, since he's a vampire with slightly accelerated healing, but an approximate timespan would be nice.
b) what would be the effect in the long term on his career as a pianist? I'm going to have him stop playing anyway for various psychological reasons, but if there's any way there'll be a physical cause as well, that would be good.