User blog comment:Nearthel/Darth Arnath, the Sith Lord (Old concept rework)/@comment-5412516-20150417023403/@comment-6292556-20150417054618

I think it means that if his Q hit someone twice they will be marked as 'someone who has been hit twice' and Arnath can attack marked target with extra range. Visually, I don't know how it will look like.