Reaction: After an objective is destroyed, move 1 focus token from a unit you control to a target enemy unit.
Reaction: After 1 or more of your units survive an unopposed engagement as attackers, deal X damage to a target enemy unit. X is the number of different affiliations among cards you control.
If it is LS turn and they attack in such a way that the unopposed damage destroys the objective can they react with Payback first and kill Moruth Doole before he can react? Doole triggers off the objective being destroyed, but Payback triggers off attacking units surviving an unopposed attack.