User blog comment:Emptylord/Leaked Champion: Vel'Koz/@comment-3974211-20140117015325/@comment-1330314-20140117031935

That's a good observation. I'm leaning more on the side of a timed effect, akin to or, particularly since from the image at least it seems like the silence procced on the first instance of damage dealt.

Come to think of it, Vel'Koz has a lot in common with, what with the ground-targeted knockup and silence.