Snape Arrives and Harry Attempts to Communicate

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Professor Snape is summoned by Umbridge, who asks him for more Veritaserum to interrogate Harry. Snape refuses, claiming he is out of stock. Desperate, Harry tries to communicate a coded message to Snape, saying that "Sirius Black" is in danger at "the place where it's hidden," but Snape leaves without showing any signs of understanding.