Decrease p2 power

[demongorne]

I would like to have that when p1 goes in start state p2 powerbar goes down of certain amount of power

[altoiddealer]

You need to hit p2, and assign an id to the hit.  If you don't want CSN1 in your anim, spawn an invisible helper to perform the hit.

Then use TargetPowerAdd controller (use a negative value) followed by TargetDrop controller