Board Thread:Questions and Answers/@comment-70.62.125.212-20150128154605/@comment-101.168.255.245-20150221135752

Your units will generally have a 60% chance to use their BB each round as long as all requirements are met (HP >50%, random 60% chance or HP < 50%). You should make sure that your arena team all use area of effect BB attacks, not single enemy attacks - you do not want to have a single enemy left who wipes out your entire team with an AOE attack