What was the arrangement Aslan made to save Edmund?

If a text made the claim that act iv was the most important act in the entire play, what evidence could you find to prove the accuracy of that claim? list one piece of evidence from the text to support that claim.

How can you tell that the text is from a biography

London includes a quote about john thornton as he is observing hal attempt to motivate the exhausted dogs "it was idle, he knew, to get between a fool and his folly". if the word "idle" is defined as "of no real worth, importance, or significance", what does this statement mean with regard to hal? who is the fool? what is hal's folly? why would john thornton think it of no real worth or useless to intervene?