[He should be very frustrated - the modifications he did to his own phone don't work, simply because of where he is. He hasn't managed to achieve communication with anyone he knows so far, and it doesn't seem like it's going to change.
He should've simply resigned himself to believe what he was originally told, that the time spent here will end once his brooch fully changes color (and he has been noticing the steady change in it, of course). But he's not the type of guy to simply accept fate and not try to fight it... Except right now, with the positive energy that's sweeping across the islands, he finds that he doesn't mind it so much.
He knows he's not the only person capable of Saving The World (TM) back home, afterall. Surely things will be alright? He did plan for his potential absence. And it's not like he can do much about it, apparently.
He'll be pondering all of this while sitting by the lake, his trousers rolled up so he can dip his feet into the fresh water, relaxing as much as he can. When was the last time he had a day off like this?]