Create 1 PA to warn when Enemy Health is below 25% (or w/e you want it to be). name this whatever you want and turn it off if you would like.
Create a 2nd PA that uses the Spell Cooldown type for SW
eath and in the textbox below the spell put in the aura id of the first 1. You get the aura id from the tooltip when you hover over the 1st one in the PA main window. What this does is PA checks the 2nd aura and whenever SW: D is off cooldown will also check the first aura and if both conditions are met will show the SW
aura. At work atm so cant give the code. HTH!