Polyjuice potion (was Re: Spinner's End)

[spookedook]

No: HPFGUIDX 156778

houyhnhnm:
I'm not sure that the "Snape" was a polyjuiced impostor.  I can't
begin to imagine who it would be, if not Snape.  <snip>

Ceridwen:
I share your suspicions that Crabbe and Goyle are not the only
Polyjuiced people in the book.  I keep returning to that Magnum you
mentioned, cocked, loaded, and left lying on the table, and keep
looking for the main Polyjuiced character.  I've thought of Tonks in
the past, and am still not certain that it wasn't someone else who
approached Harry outside the RoR.  <snip>

As for who, in every instance where I suspected Polyjuice, my mind
went directly to Narcissa.  <snip>

<<SNIP>>

Tinktonks:

Nobody would need to polyjuice Tonks--she's Metamorphamagus (Probably
spelt ALL WRONG sorry!) all they'd have to do is act like her. But I
can't see anyone else getting all snuggly with Lupin ; ) We can rule
out Fenir because of Bill's wounds being cursed wounds, Lupin is a
distinct possibilty as he definitely acts a little strangely in the
scene after the fight, is it just because of the werewolf attack?

Here I'm going to give a whacky theory and it will be ripped to
shreds, but hey.

Prof Flitwick was under the imperious curse and sent to call Snape
by the DE. That is why Snape cursed him, to lift the imperious
curse. He left his office without telling the truth because he
wanted to keep Hermione and Luna out of danger (he knows them, and
that they would want to fight to save their friends even if it meant
getting killed).

Tinktonks