A contradiction to consider

[potioncat]

No: HPFGUIDX 135214

 
> CathyD Now:
 
> Apart from this it would be force of habit, wouldn't it?  Everybody 
knows you can't apparate out of Hogwarts, they were in a rather 
pressing situation and didn't have time to think..."Oh yeah, DD's dead, 
we can apparate right from here."


Potioncat:
Hi Cathy, I haven't seen your name in a long time, good to see your 
posts again!

I think you make a good point, but I'll add one. "If" DD's death did 
disactivate the Anti-Apparition spells,even for only a brief time, 
Snape wouldn't want the DEs to know it. They wouldn't think of it, and 
he wouldn't want to reveal it.