A Petrified Ghost?

[InfiniteWhispers at Aol.com]

No: HPFGUIDX 82025

Hi everyone. I mostly lurk, but I have a question today. I searched the 
archive and found nothing, so forgive me if this has been discussed. 

In COS, Sir Nicholas is one of the ones who is petrified. The others drink 
the mandrake potion (I'm assuming you have to drink it b/c Hagrid talks about 
"stewing" the mandrakes) and then they're okay again... but Sir Nicholas is a 
ghost. He can't drink anything. How is it that he is able to be un-petrified?


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