It's fine; Dimitri understands the loud noises that Pokemon make. He may not get the words, but he understands a lot of The Vibe. So he just sighs, and holds the still intact watermelon close to his chest so that Gillian can't get it.

"At least it was just the one watermelon... I should have known something like this would happen when I let two troublemakers out in such a crowded place."