PW:S spam works exactly as you'd expect for Twins, but because of Weakened Soul and the way the damage occurs, Holy has stronger tools (empowered Renew, better ProM, CoH) for healing the damage.
PW:S spam is strongest against infrequent spike damage like Kologarn's Overhead Smash or Freya's Ground Tremor; it is comparatively less powerful against persistent periodic damage like the Twins aura ticks.
Originally Posted by Heenk
"IRONBRANCH, THE FLOWER BED IS IN DANGER! ASSIST ME!"
PW:S spam also works on Faction Champs. You can do it full time, as well as have a quicker Mass Dispel for the Bloodlust/Heroism they do, all the while be able to run around (and away from hostiles) without batting an eyelash.