linkhyrule5 comments on Harry Potter and the Methods of Rationality discussion thread, part 20, chapter 90 - Less Wrong
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Well, he mentions it casually to McGonagall, who did not see it before:
All that tells her is that he figured out the Patronus somehow. She doesn't know that there's a 2.0 version.
Neither do F&G, really; it's unique and humanoid, but the real secret is that it kills (un-kills?) Dementors.
The real secret is that once you know why it works, you can never cast Patronus 1.0 again. The humanoid form is a clue, so Harry needs to conceal it.
Killing Dementors is awesome, but in the short term the benefit of showing that ability off does not outweigh the risk of leaving all wizards everywhere defenseless against them.
It's also significantly brighter than normal ones (Patroni? Patronuses?)