User blog comment:Yapby/All Unreleased Contents (Units, Quests, Raids)/@comment-173.187.78.156-20150821234556/@comment-71.167.5.30-20150823135648

Actually, rarely, some bosses can spark with themselves. I think it was Cardes' Trial, but either Cardes or Zebra sparked with themself because their attack animation continued for a while, and started another attack before it ended. There are also a lot of instances in Trials where you fight multiple enemies, such as Cardes, Lugina, and Seria.