Adam's double will only be running around for a day or two before he runs into it, decides it's much better off gone, and kills it. That's not emotionally scarring or anything, so it's fine. After that he'll mainly be dealing with other people's doubles, I think, though that part is all a little up in the air! If you'd like him to run into yours, I'm down with that. He'll be unlikely to kill anyone else's double unless his life is on the line, and then he would feel very bad if they were his friend.

If you want to run into his double before he kills it, that's doable too. It will be inclined to attack people's emotional weaknesses and attempt to drive what few friends Adam has away. It will also be not at all averse to using physical violence, either, though it'd be more likely to do that if Adam is around to see, because it would really upset him. But again, it won't have the chance to do TOO much damage! I'm happy to have anyone run into the double before Adam kills it, though.