Why didn't C!M apparate?

[Caius Marcius]

No: HPFGUIDX 113653

--- In HPforGrownups at yahoogroups.com, macfotuk at y... 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.
> 
Even if BC Jr. had the Dark Mark, surely the real Alastor Moody did 
not - so wouldn't Crouch's Dark Mark disappear once he was Polyjuiced 
into Moody?

   - CMC