User blog comment:IamJakuhoRaikoben/Chapter 500: Fire and Ice, Review./@comment-5303512-20160905195610/@comment-7418318-20160905201615

It's actually the power of feelings that was made official, not the power of friendship.

It also fits better with all the situations. Wanting to protect, stubbornes (i.e. unwillingness to lose), love, grief and in some instances also hate, rage and vengeance.