If you move too far away from the shadow created by Living ShadowLiving Shadow you can no longer switch places with it. An arrow indicates the direction of the shadow from Zed and changes colors depending on distance. If it is green then Zed is close enough to the shadow to swap positions with it; if it is yellow or red then he is not.
The skills also may allow you to catch enemies off guard after a small skirmish. Using Death MarkDeath Mark primarily for damage, do not forget that it places a shadow behind your target. Faking retreat after a kill, decieve your enemy by swapping places with your ultimate shadow and use your Living ShadowLiving Shadow to effectively give your Razor ShurikenRazor Shuriken 50% more damage output.
Razor ShurikenRazor Shuriken doesn't stack past 2 in a single cast. Landing 3 or more on the same target in the same cast will not increase your damage.
Living ShadowLiving Shadow can come in very handy when running away from an enemy champion. Try placing your shadow in a bush and run in another direction, then activate the secondary ability effect to fool your pursuer and escape easily. In some cases this strategy is way better than just simply using the ability to dash away.