I haven't read it, so I can't speak to the specifics like Griffyn can, but demonstrations of anger toward injustice is a big deal to Listens to Wind, if Ebenezer's line at the end of Turn Coat is right. LtW offered to teach Harry about dealing with that kind of anger, so adding it to Wild Card makes sense; it's another check in the "Harry is smoldering with rage most of the time and should probably get that under control" column. Not sure about the threat, though, cuz I haven't read it yet. (I'm waiting for Brief Cases, so I can do a full DF read-through, in order, and hopefully finish right around when Peace Talks comes out).