But none of them are a werewolf. If you had killed other werewolves fine, you'd have consistency issues. But given the game slapped you across the face saying Don't fight the werewolf. You can't win! Don't even think about it. It won't work!, it's hardly inconsistent.
Unless you were metagaming your character, knowing that in the rules the game is based on, you should be able to hurt the werewolf in spite of the gigantic, obvious warnings a far more elite, superior, and knowledgeable vampire was telling you just moments before the werewolf came lunging out at him and in all likelihood killed him. Telling you straight up that it was pointless to even attempt to go up against a werewolf. The same vampire that had no qualms telling the Prince bull**** at the beginning of the game, and dealt with a group of Sabbat that were about to ash your ass like he had ice water flowing through his veins, but was so absolutely scared of sticking around because of these werewolves.