(alan-jaff, you missed the words "in ADDITION to the initial bolt")
PS. This is not "a new player question" anymore and should be moved to somewhere more visible.
I think you don't understand what people are complaining about.
Before this patch, the ability restored magicka if you killed them with the Bolt itself. After the patch, it was supposed to restore magicka if you killed them with both the Bolt and the Explosion.
People are complaining that its restoring magicka for neither situation.