To be quite honest, Dorcas felt bad for James. He had to go through these measures to remind his friend who he truly was. The way his face toyed with the different emotions, showing a raw vulnerability, there was no way one human could turn down another's despair.
"Nah, mate," she said with a bit of a coy smile, "No need for returned favours. It's just what a Gryffindor does, yeah?"