Better, maybe when the spell wears off, he just returns to his original size, but he's still a seapony. So he has to find the ship, but on the way, he ends up running into crabs, seaweed, shells, etc. And ends up looking like a sexy seapony.
Worst still, he runs into a male seapony who thinks he's a girl and wants to dance with him. Brainstorm refuses, but a school of tiny fish swim up his dress and start tickling him.