The duelling scene in book 2. It seemed to me as if Snape was perfectly aware of the fact that Harry's a parseltongue. First of all: Why would Snape want to be an assistant to Gilderoy, above all people, if he wasn't up to something? He seemed to have planned to get Harry and Draco fighting against each other and it was Snape's idea to use the serpant conjuring charm that led to Harry being exposed as a parseltongue...and Snape didn't seem a bit surprised. But how could he know? And why would he want the others to know? Ideas?
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