Shadows and echoes are implemented very differently.
Even if it were like shadows, I’m not sure how we would do warpath. Being both a channeled and movement skill, the target acquisition and updating to be effective would be nuts. This is the rabbit hole that we end up going down when trying to make it work. How long does it hold the channel for? The check for echoes happens when you initially cast the skill. So does it have a fixed duration? That ends up with people tapping warpath instead of holding it. It probably shouldn’t be right on top of you because it’s already fairly noisy. Does it go the opposite direction of you to avoid? Does it simply spin in place? What if you have the no move node?
This list of problems with it goes on and on. I don’t want to say that we’ll never do it but unless a really crazy awesome solution is found to fix this and more, we likely won’t spend dev time on it pre-1.0