It wasn't so much that Finnick minded being naked in front of a stranger. God knew he had plenty of experience with that. It was just being surprised by it that was throwing him off.
"Yeah, thanks." He brushed off the worst of the sand and put his underwear and pants back on. "Probably not what you were expecting to see this morning? I don't usually sleep naked on the beach. But..." He shruged, "Just chalk it up to island weirdness."