I read this on wowhead in the comments of WoM... can anyone confirm?
if this is true it seems to imply that WoM synergizes way better with atonement healing than direct healing...■ WoM does stack from both atoned offensive spells & their multistrikes
■ WoM does not stack from the multistrikes of direct healing spells
■The free Prayer of Mending does NOT trigger from Atonement, you need to cast a direct heal to trigger the free PoM.
■ Penance cast against a hostile target grants you 3 stacks of WoM; unlike using it on a friendly target only grants you 1 stack (granting you up to 6 potential stacks from ahostile cast if all 3 hits multistrike)