There’s a little confusion in my opinion about whether this skill is working properly or not. I believe it isn’t and I’m surprised that this hasn’t been fixed yet. Some people say that it’s bugged because you lose the speed boost while you’re in combat. I’m in the impression that this is wrong, but that’s not the issue I want to talk about.
What I’m sure of, and this must not be working as intended (I hope) is that Signet of Shadows doesn’t give you bonus movement speed when you strafe, which is very odd and make your character move in a wierd way. There’s already a move speed drop when every character strafes compared to when they run straight ahead. But with SoS, the mov speed drop when you strafe is huge and it looks really wierd. This needs some attention.