User blog comment:AP Sejuani/Champion Rework: Zilean, the Chronokeeper/@comment-5077844-20141219212545/@comment-7709681-20141219225748

Slowing projectiles could represent as much of a challenge as Wind Wall and Unbreakable, but, as them, not impossible. But I'll argue that is contradictory to put such effect on an ability that is meant to be used on a near death ally.