[@AlternateMan] Okay! I see what you're saying now. I think the better phrasing for that would be: The first attack/skill executed by all allies after receiving the buff receives a 30% boost to damage dealt. The math is a little off there, as it would instead apply before the defensive stat is reduced so, using what you just gave me the calc would look like this:

Rio uses Claw on AlternateMan! (4 Atk x 1.1 Damage x 1.3 Boost = 5.72 –> 6 Atk Damage)

6 Atk - 1 Def = 5

AlternateMan takes 5 Damage!

HP: 5/10