QUOTE : As Dumbledore said, Snape suffered a severe disappointment when Sirius escaped: he had hoped for some closure. If Dumbledore was able to speak to Snape after his flashback, acknowledging what his gag order had cost Snape and admitting his errors, that conversation might have functioned like a Time-Turner for Snape. He and Dumbledore would have been able to think back to the moment of Snape’s student trauma and acknowledge Snape’s innocence and suffering in the matter. This would have enabled Dumbledore to see why Snape would go to any lengths to protect other students from undergoing the same ordeal and led to Dumbledore lifting the confidentiality ban.