Let me start by saying that this is a fantastic change when it comes to PvP, and I understand why it was increased to 5 light attacks. However in PvP with all of the RNG dodging, and non-ideal circumstances this ability just got nerfed. In PvP landing 4 light attacks within 20 seconds can certainly be a challenge, by increasing this to 5 attacks this ability will be a lot less reliable in PvP.
My suggestion is a very simple one: increase the duration to 22 seconds. It doesn't seem like much, but I believe it'll be enough to maintain this ability's reliability in PvP without making it over-the-top in PvE.
Thoughts?