PoA MOVIE DISCUSSION.

[Carol]

Carol earlier:
> > BTW, any thoughts as to why Lupin (in both the film and the book) rode the Hogwarts Express (unlike any other teacher till Slughorn)? 
> 
> 
> zanooda:
> 
> Maybe DD knew that the train was supposed to be searched by Dementors, so he asked Lupin to be there just in case? You know, in case some of the kids get sick after the contact with a Dementor (Lupin had chocolate with him, maybe for this reason), or in case Dementors get out of control, or something like that. He didn't trust Dementors, Dumbledore :-).

Carol responds:
That makes sense. He knew that the MoM was stationing Dementors at all the entrances to the Hogwarts grounds, so he probably anticipated that they'd search the train, too.

Zanooda:> 
> After all this talking about going-back-in-time :-), I have a question as well. How come Lupin didn't see back-in-time!Harry and Hermione on the Map? He says he watched the Trio go to Hagrid's and then waited for them to come out, which means he was looking at the Map all the time. 
> 
> Back-in-time!Harry and Hermione also came to Hagrid's cabin and were hiding outside. How could Lupin not notice that there were two Harrys and two Hermiones on the Map? Does it mean that the Map can't show back-in-time!people?
>
Carol responds:
I know we've discussed this problem on the main list. In the book, he also watches them enter Hagrid's hut and waits for them to come out. Apparently, the inside of Hagrid's hut doesn't show up on the map or Lupin would have known that Pettigrew was there. In the book, he sees that Pettigrew is with them but it doesn't occur to him that Pettigrew is Ron's pet rat; he thinks that the map is malfunctioning until he sees Sirius coming at Ron and Sirius, Ron, and Pettigrew entering the tunnel together. Then he runs out without his potion. Apparently, he's too focused on Pettigrew to think about anything else.

As for why he didn't see TT!Harry and Hermione when they were in the forest, maybe he wasn't looking at that part of the map. (They didn't enter Hagrid's pumpkin patch until after HRH had left Hagrid's hut, going the opposite direction.) Lupin probably just followed HRH's dots to and from Hagrid's front door adn from there to the Whomping Willow and wasn't looking anywhere else. He didn't see Snape coming toward his office with the potion, either, apparently.

Carol, who thinks it's possible (though just barely) to figure out a logical explanation in this instance