Why didn't C!M apparate?

[Hannah]

No: HPFGUIDX 113649

Mac wrote:
> Unless he was ordered to stay put at Hogwart's by LV*, why didn't 
C!M apparate to join his master? How come he didn't 'know' from his 
> left arm dark mark that LV had been re-embodied? he asks Harry 
> several times if LV was really back.

Hannah: To disapparate to LV's side he'd have had to get out of 
Hogwarts, which would be suspicious.  At that time he is disguised 
as Moody and has Moody's body.  So he wouldn't have a dark mark to 
burn (hence why he doesn't know if LV is back or not).  It makes 
more sense for him to stay at Hogwarts - why blow his cover now?
> 
Mac continued:
> * on a theme related to how is it that the triwizard cup was a 
both ways multiple journey portkey (thread a month or so back), WHY 
would C!M, having achieved his task of sending HP to LV, not 'get 
the heck out of there'. 
> 
Hannah: I've always wondered about that.  Perhaps Portkeys do always 
work both ways?  Trying to think of canon evidence for/against 
this.  Unless Harry performed some 'hysterical magic' and that 
enabled the cup to become a portkey in the reverse direction.  He is 
under a lot of stress and it's been shown before that when a wizard 
is in danger they can perform magic unintentionally to save 
themselves.
Hannah