[He watches the symbols with some interest, finding them similar to other spells and enchantments cast by others. And when he feels that warmth he can't help but raise his arms a little as if trying to watch the effect in action while listening to her explanation.]

Alchemy... I see. I'm somewhat familiar with the concept, but I've never had it directly applied to me like this. [Interesting.] It seems to be working, so your practice has paid off.

[It might take a little longer for the clothes, but he can feel his exposed back, sides, and face already drying off. He then lightly places the stone in her outstretched hand.]

...Eustace. And I should be thanking you for this.

[Seems only fitting to give her his name since she's doing this and also since she kept calling him "stranger."]