Board Thread:Naruto Discussions/@comment-27662856-20180316054643/@comment-31338621-20180409110105

Hiashi's said he saw bloodlust from his brother even though his back was turned to him. I have emphasize the fact that he saw bloodlust, even if his Byakugan didn't appear to be activated. Maybe his it's possible for Hiashi to show some Byakugan traits without his Byakugan activated, similar to how Sasuke showed some sharingan traits on his normal eye before awakening it.