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    This is a nice answer -- I like your thoughts on the (possible) use of controlled emotions to deter Dementors. An interesting idea. +1 Commented Feb 21, 2015 at 4:21
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    Original thought, and a brilliant one, I should say, the possible use of concealment of emotions. I'm just waiting for a few days to accept this answer, unless something even more surprising and dramatic comes up. This also helps in answering scifi.stackexchange.com/questions/82055/…, which partly motivated me to ask this question. Commented Feb 21, 2015 at 11:27
  • I wonder if Snape had a particular objection to Patronuses in relation to Harry, given the revealed nature of his own Patronus.
    – Etheur
    Commented Jul 29, 2015 at 15:38
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    It would have been revealed his emotional attachment to Lily, and Snape hated showing vulnerability--though he apparently didn't mind using his Patronus anonymously, as he did in DH. His spy role was probably a major reason, as well. Death Eaters cannot produce Patronuses. If Voldemort discovered Snape's ability, he might have realized that Snape was not trustworthy.
    – E. J.
    Commented Jan 4, 2016 at 4:22
  • Another possibility would be spells producing bright, sustained light, as it is mentioned that they are creatures that thrive in darkness.
    – Gwyn
    Commented Feb 11, 2021 at 2:42