Too bad Tommy can't say that he hasn't been apart from his own twin. Not by a long shot.

"Well, how about we make a plan, okay? I know I would want my Billy watching out for your Tommy if they were together, to make sure he didn't get into the sorts of trouble you know he's capable of. Meanwhile I know that your Tommy would want someone to watch out for you and protect you like a big brother should, right? And maybe call you a nerd from time to time. So I'll do that for him. And together, we'll get through this."

Because like hell he's leaving a kid witch alone in a new world, unable to even work to feed himself. That's just not Tommy's speed. Not at alll.