Just found this on the mtv blog. It's got the "they've got brooms" movie embedded, but I don't know if we've seen the article here before.
No one bothers Stewart between takes as she comes back from whatever place she has to go to find her sorrow. On almost every occasion, it is Pattinson who will eventually walk over, give her shoulder a light rub, and bring her back for the next take. If chemistry is a concern to the "Twilight" fans, they can sleep well from here on out.