"This action games the effect, cost and any special restrictions of the chosen action"
Do I read this as the action automatically succeeds, just use the damage track?
Said another way: Target an enemy and chose one of those model's skill. Then use that skills damage track to have the target model apply damage to itself. Apply any effects, but ignore any triggers.
I have taken the assumption that it is just the damage track, so engagement rules for Ranged or Melee are not applied.
Thanks for the excellent clarifications thus far!