So, you’ve just completed the Forest Temple. Beat the boss, snatched the Heart Container, and you’re making your way out to Hyrule Field.
When all of a sudden - CRASH!! That boss you thought you’d killed is still kicking, with a vengeance.
Link’s up on Epona in an instant, withdrawing his newly acquired bow - and you’re thrown into an unexpected part two boss battle.
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When Nintendo was talking about breaking the Zelda formula, this is what came to mind for me. I think it’d be a pretty fun way to put the players on their toes early on in the game.