[ Bruce falls silent, considering. He hadn't really thought of this particular species, sentient or not, ever developing any kind of technology such as their own, and even if so, to have the wish to leave their planet. But... he can work with that possibility too. ]

We can build in some kind of shutdown mechanism, in case they ever want to turn it off. A manual override. Something not so simple that they'd lower the barrier accidentally, but not so complex that they couldn't figure it out how to do it. [ Balance is complicated there, though. He doesn't know nearly enough about these creatures— but he can try. ]