[He doesn't know what x-ray means, but it sounds probably useful??]

I don't know about that. This marker dwarfs the rest, and all the stones close to it show the same date of death... it could be the name of the town itself.

[Which raises more questions than it answers... but when he hears the cries start up, he looks toward the water. It still sounds distant, but clearly it's close enough to be heard from the island.]

There it is. Let's go.

[He starts following the sounds. He may have preferred to do this alone, but if he has to have a companion, he's going to make sure to keep an eye on her.]