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He could see that but he had to keep his identity a secret.

I think that Voldemort did see it, but that Snape explained it away with the same arguement which he gave to Bellatrix: That, thinking the Dark Lord had left them, he (Snape) as well as others were waiting to see if Harry was a Banner around which they could once again gather. In true Slytherin manner, he was looking for a new angle to further his own glory.

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