The results of the departure are less impressive in Williams’’ case, but there’s still a notable maturity to “The Sea Beast” that could have clashed with the mostly sanitized storytelling that currently dominates Disney. Sailors drink their pints and bleed when injured.But though one can appreciate Williams’ and Benjamin’s interest in crafting a philosophically layered fable, there’s a righteousness to the message of “You must change!” that blindsides the adult characters.