WalterL comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 110 - Less Wrong
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Comments (112)
I think we finally have a good explanation for Harry's Father's rock: Dumbledore's mysterious divination power. He somehow knows the rock will be important, but perhaps not exactly how or why.
The rock was important to kill the troll. That's the sum of its importance.
But how did Dumbledore know that it would be a good idea to carry a rock? It's not a good weapon against humans; it's not a good weapon against things you can stun; it's not a standard precaution. (Also, Harry's still carrying it)