Board Thread:Questions and Answers Forum/@comment-64.121.77.238-20160727002815/@comment-24057866-20160727181025

No, killing enemies who are tethered by Shadowshot (and killing enemies while buffed by the Defender Titan's Ward of Dawn) do not count as Void Ability kills.

If you kill an enemy with the Shadowshot itself, I believe that counts. So select the Quiver perk, and when your Super is up, kill three weak enemies with it.