Originally Posted by MachThreeSlug

The attack down/skill down only applies for the squad that has them.

I think the better question to ask is how long does the enfeeblement/enhancement last (duration of effect) I'm sure it doesn't last the whole fight either.

*during the turn for the squad which the enhancement/enfeeblement was enacted, I'm not talking about the entirety of the boss fight for all 4 squads*