User blog comment:Yapby/All Unreleased Contents (Units, Quests, Raids)/@comment-59.189.107.158-20150617094051/@comment-68.53.111.182-20150618032828

BC fill when attacking = every turn you attack

BC fill when being attacked = every turn you attack, defend, support BB, or are paralyzed (even if uncommon for Melchio)

The exception being when the enemy uses support skill or is paralyzed, but I prefer having more options than attack every turn.