A couple of OotP puzzles for me

[potioncat]

Carol: 
> Also, didn't having Cho confess to Umbridge mean that Umbridge used
> Veritaserum on her, which would mean that Snape must have supplied her
> with real rather than fake Veritaserum? If so, there goes his subtle
> undermining of Umbridge. And he didn't even get his Babbling Beverage
> line or his order to crabbe to release his chokehold on Neville. Sigh!


Potioncat:
I was so disappointd with that scene. At first I thought, oh, there's 
Snape letting them know that Cho couldn't help telling Umbridge. Then I 
realized it messed up the whole dynamics that was going on in canon. 
Also, Snape isn't dismissed, doesn't leave, just very suddenly isn't 
there.

Of course, in GoF, Snape pours a bottle of Veritaserum down Barty's 
throat. So much for the "...I told you that it only took 3 drops." line.