Priori Incantatum and Snape vs Lupin as students

[Allyse at my-deja.com]

No: HPFGUIDX 15385

Coming in a bit late to the discussion re Priori Incantatum; I'm 
still three digests behind! Superb summation of chap 36, Penny.

Someone (sorry, I forget who) wondered if PI might not be so 
uncommon - after all, unicorns might supply dozens or even hundreds 
of tail hairs. But I would like to suggest that the PI effect might 
be very diffused under such circumstances, and it there was a double 
rarity at work with Harry's and V's wands: first, that they shared 
cores, and second, that they were the *only* wands that shared 
Fawkes' feathers. Since there were only two wands in existence with 
that specific core, the effect might have proven to be much more 
powerful.

Just a theory... :)

As for the question of why Snape didn't "accidently" slip up with 
Lupin's status when they were still students at Hogwarts, I would 
suggest that once Dumbledore discovered that Snape knew, he might 
very well have threatened *him* with expulsion if he revealed Lupin's 
lycanthropy to others.

Allyse