[Ah, the ever prevalent problem of not being able to return home. Beyond merely saying that Bruce plans on finding a way back if it kills him, he doesn't have much comfort to offer concerning that. They're all in the same boat, they're all displaced. Some take to it better than others, but some, like Sam (and like himself) have very important things waiting for them back home.

Bruce doesn't have any alleged siblings in his universe, but he can understand Sam's dismay, being caught between two very difficult choices.]

The ones you care about might not always understand, but you'll just have to do your best to ensure you return home to them every time. [That's the best he can offer.] That, or you learn to live with the fact that you stopped looking. There's no easy answer.