Quick question re: Lupin's resignation

[pippin_999]

No: HPFGUIDX 107558

 
> Now me, Liz (who lurks a lot but doesn't post much!):
> 
> I agree with Sherrie, that the potion had to be taken the full 
week before the full moon, almost like that much needs to be in 
his system constantly that week leading up, and then the 
accumulative amount during the full moon. Because if he only 
had to take it once during that week leading up to the full moon, 
he could just ignore the lunar calendar and take it once each 
week as a precaution. I think it's just like the birth control pill, 
you've gotta do it on a schdeule or it doesn't work right. So he 
forgot it that night, and that's when he was out in the full moon, it 
wasn't safe, and that's why he transformed.<

Possible. But it could work like the polyjuice potion, which lasts 
for an hour from when you take it, only in this case the effective 
period would be seven days. In that case, Lupin would only have 
to take it  "in the week before the full moon" because regardless 
of when he took it during that period, the dose would last long 
enough to protect him. 

Since the potion is very unpleasant to use and very difficult to 
make, I can see why Lupin wouldn't be taking it every week as a 
precaution.

I find it hard to understand why Snape and Lupin would be 
conversing in code during the goblet scene. It's easy to 
understand the map episode, because neither Snape nor Lupin 
wants Harry to know about the relationship between the map 
and Sirius Black. But it seems odd that Snape would actively 
conceal a fact about the potion on Saturday when he's planning 
to drop hints about Lupin's nature the following Friday in DADA 
class. Or do you think he was trying to put Lupin off his guard?

Pippin