Fin's comment was definitely directed at the weird marks, he was thinking that maybe he could get half an hour without them but now they were appearing before he had even got there, just what he needed, psychic scribblings. He thought he was the only one plagued by them and it was the town's way of trying to piss him off for those years away.
He glanced around, Fin did notice the guy sitting on a nearby bench with icy shoulders trying to keep cool but didn't think anything more than 'Smart man' as he concentrated on forming a small ball of water in his hand, drawing the moisture in from the humid air around him as well as the pond. Once it had grown to the size of a tennis ball he threw it at the painted figures on the grass, they'd probably reappear in a minute but hey, throwing a ball of water at it made him feel a bit better.