On a related tangent, I suspect another lesson he's learned (and that is repeatedly reinforced throughout the books) is that calling people on the rules is no use unless you personally have the power to enforce them.
CoS comes to mind when Snape went on about 'flaunting the decree of underage wizardry.'
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Date: 2005-04-19 07:31 pm (UTC)CoS comes to mind when Snape went on about 'flaunting the decree of underage wizardry.'