I was thinking more like using it on himself and the blood of dead corpses or even just blood stains on the ground or whatever. Maybe control the blood of live animals but I don't care much about that. 

Just wondering if I could cut somebody up and hasten the bleeding.
Or control a corpse with blood from afar, even making it levitate.
Since water magic also includes healing, resupplying my body with blood besides healing the wounds would be easy no?