Why was Snape able to use the Headmaster's office in Deathly

Severus Snape's portrait, Harry Potter Wiki

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Why did Snape search Grimmauld Place in Deathly Hallows, the time he took Lily's picture and signature? If he was on the good side, why would he search the place? - Quora

How was Snape able to deflect McGonagall's spells in the Deathly Hallows Part 2 film? - Quora

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In Harry Potter and the Deathly Hallows, when McGonagall duels Snape, did he deflect the spells to hit the carrows on purpose? - Quora

Professor Snape : The Headmaster Office by OpalChalice on DeviantArt

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Why was Snape able to use the Headmaster's office in Deathly Hallows when McGonagall would have been the rightful replacement once Dumbledore died, being Deputy Headmistress? - Potter Heads of All Ages

Why was Snape able to use the Headmaster's office in Deathly Hallows when McGonagall would have been the rightful replacement once Dumbledore died, being Deputy Headmistress? - Quora

Why was Snape able to use the Headmaster's office in Deathly Hallows when McGonagall would have been the rightful replacement once Dumbledore died, being Deputy Headmistress? - Quora

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