A Personal Focus can be taken. It cannot be used by anyone else. The do-hickey can be the source of the power, but if taken, nobody has access to that particular power. My thought on this is such: in the first Blade movie his sword would destroy the hand of anyone holding it that didn't know how to stop that from happening. In the movie it is safe to assume Blade, Whistler, and as revealed, Deacon Frost knew how to stop that. Technically I'd make his sword a Personal Focus.