Harry getting Unfrozen on the Tower...

[houyhnhnm102]

No: HPFGUIDX 155442

Cyril:

> The only reason that I could think of for the spell to 
> be released would be if Snape did it (nvbl of course). 
> This would be only becuase DD informed SS about Harry 
> being hidden under the Cloak (through Legimency and 
> Occlumency) - without which Harry would be there for 
> a long time to come - with probably no one ever looking 
> for him at that spot (unless Ron/Hermione use the Map 
> to look for him somewhere in Hogwarts)

houyhnhnm:

I agree that there is no certainty that a freezing charm 
is cancelled when the caster dies.  The idea of Snape's 
casting a non-verbal Finite Incantatem hadn't occurred 
to me but it's an interesting idea.  If that's what 
happened, it would be the mirror image (there are so 
many of them in HBP) of Tonks releasing Harry from 
Draco's freezing spell when he was hidden under his 
invisibility cloak on the train.  Her Finite was 
also non-verbal.