It's interesting...as I have been rereading OotP I've been making note of how pain in general is presented because it seems at times like "good" characters feel real pain while other characters don't. For instance, we've talked about how pain is less noticed in the WW, but boy, you certainly are made to feel the pain in Harry's hand after his detentions, aren't you? Hermione's even waiting with Murtlap--and later Harry wants to recommend it to Lee. McGonagall being hit with four stunners seems very violent and our pov characters seem frankly horrified by it, but elsewhere people can be hit with many more hexes at once and it's no big deal.