He's notices that shift in body language - he's been trying to be a little funny, and he's pleased she's trying to be funny back, but she's clearly on higher alert than he'd realized. Well, he can hardly blame her. That she's called the people worried about missing her friends and not family hasn't gone unnoticed either.

He grins and rolls his eyes at her, playfully, before he raises a hand and uses the Force to lift one of the larger shells around them on the beach, and gently pulls it to hover between them.