Sometimes Norbert will take a swipe at someone and I too think there will be damage, but nothing more than a bruised ego comes of it. Pippin is the toughest....he can take some swats and he can dish them out. Usually he wins the swat contests and the others give up.
Hopefully Lily is savvy enough to get out of the way when Luna gets in a mood. Usually they seem to get along so well. Hope Luna is feeling OK.