dclayh comments on Harry Potter and the Methods of Rationality discussion thread, part 2 - Less Wrong
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Chp 39 (the Dementor)
I think that Dumbledore and Harry were too quick to conclude that the Dementor could just be used as a distraction. It was Harry's first idea (once he turned cold), and Dumbledore stopped him there. Cold!Harry didn't even spend 5 minutes on the problem - compare with Harry's instructions to Fred & George in the Hold Off on Proposing Solutions MOR chapter. If there's a plot, that seems much too obvious for Quirrell.
What immediately occurred to me (similar to the infamous scene in The Princess Bride), is that if your opponent believes you will have a distraction and a real attack, simply lauch two real attacks, with the expectation that whichever one the opponent takes to be the distraction will succeed. Obviously this requires a greater sacrifice of materiel, but Quirrelmort doesn't exactly seem short in that department.
Do one better. Have an obvious distraction, a less obvious distraction, and one real attack. That way, when your adversary discovers the less obvious distraction, he'll stop looking.
Why would you ever have only one real attack? I could see an argument for maintaining a 2:1 distraction:attack ratio, but you should never hang all your hopes on a single plot.
He appears to be working with much less than his former amount of magical ability.