Snape died believing that Dumbledore meant to sacrifice Harry. Perhaps, once his portrait is installed, his portrait can talk to Dumbledore’s and understand better that Dumbledore meant to help Harry free himself of Voldemort. Perhaps Dumbledore’s portrait can finally explain that he withheld information about Horcruxes not for lack of trust but because he cared about Snape enough to protect his life. Perhaps, when she moves into the headmistress’s office, Professor McGonagall will get to speak to Snape’s portrait about the heartbreak of his apparent betrayal and her even greater heartbreak
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