Board Thread:Game Discussion/@comment-11165765-20130904161835/@comment-9890645-20130904181420

Ran: Correct. There is no additional damage dealt to surviving members of a trio when one member dies.

The real factor is when one full trio dies, as Schapp has hinted at. Once one trio dies, the other trios take more hits. Thus, ensuring one member of each trio lives as long as possible is crucial to having more consistent and predictable damage dealt to the boss.