Depending on if the Null already got ahold of them we might not have a choice. Unless we can sever that tie somehow. Or pull those things out of their heads. Though from the video I'm not sure we'd be able to without killing them or it being agonizing. It might be better to end it quickly.

[To put them down like rabid dogs that can't be trusted. That's what they would have done to him if he'd managed to get out of Jacob's bunker with Rook. It's probably better for everyone if he died, it might be better for these creatures too.]

The Null will be the problem, not the nautilus things. If it wasn't for the Null they would probably not be anywhere around us.