User blog comment:Willbachbakal/(Champion Rework) Varus, the Arrow of Retribution/@comment-25228021-20150501160206/@comment-1330314-20150503191005

If you'd like, we could talk over chat or on my message wall, just let me know when you'd like to talk.

The idea behind Parting Shot is that you'd use it in between other ability casts, e.g. W AAA E AAA Q AAA W etc. (or even W AAA E AAA W AAA Q AAA etc.): assuming you detonate three stacks at a time with W, Q and E, that would shave nine seconds off the cooldown, which would be more than enough to refresh the ability. Just using Parting Shot and any other ability would shave off up to 6 seconds on its own, so you'd be likely to be able to use it again immediately after, especially at high amounts of cooldown reduction (maximum CDR would allow you to use Parting Shot as little as 3 seconds after casting it, without assistance from Runaan's Hurricane, and even just 20% CDR would bring that up to just 5, so you'd be able to use it for sure after every other ability cast).