Lets say my opponent has 6 characters, the Blackfish, Catelyn Stark and 4 non-unique characters. I play Wildfire assault as my plot :When revealed, each player chooses up to 3 of his or her characters. All characters not chosen are killed (cannot be saved). He plays Power of Blood: You may have up to 2 copies of The Power of Blood in your plot deck. Noble characters cannot be killed. To resolve my plot he chooses 3 of his non-unique characters and kills the last non-unique. Was this performed correctly? Does the power of blood make the noble characters illegal targets for wildfire assault? Or did my opponent pull a fast one on me?