Why Lupin was on the train (Was : Dumbledore, Head of House, Portkeys

[prefectmarcus]

No: HPFGUIDX 42851

--- In HPforGrownups at y..., "Rita Winston" <catlady at w...> wrote:
> Dumbledore knew that Lupin is a good guy, and I (being slow on the 
> uptake) only realized last week that the reason that Lupin was on 
the 
> Hogwarts Express, instead of arriving before the students like all 
> the other teachers, is that Dumbledore had asked him to ride the 
> train to guard Harry (at least I figured that out for myself before 
I 
> read it in a fanfic!).

If that be the case, how did Lupin know which carriage and which 
compartment he had to be in to watch Harry?  If he was only 
pretending to sleep, how come he didn't recognize Scabbers?

It is possible that Dumbledore asked his new DADA teacher to be on 
hand when the Dementors searched the train, but Dumbledore's concern 
is for all his students, not just Harry.

No, I think the easiest explanation is that Lupin's appointment was 
held up until the last minute due to the objections of people not 
wanting a werewolf teaching the children.  

Marcus