In the end of the morning. He's still alive "to flee" original thoughts flashing but he is still missing the most important thing, and that is "the Castle", key perilous.
Finally morning arrived. He was alive, "had escaped" the original idea flashed. But he lacks the most important thing. And what is "Key to the Castle," it
Finally, the morning came, he was still alive. "Run" the original idea flashed on, but he still lack the most important thing, and that is "the castle". Itself.