Rex blinks at the request and then his entire expression melts into something far softer. "... yeah, I can do that. Where's the well? And why not here? Why can I see you anyway?"

He's going to tell his new set of adults (César, Magne, and Touya) about Linette, then see what else they can do for her. Normally, he doesn't have an investigative bone in his body, but favors need to be done right. And also ghosts are pretty cool, and he's curious.