[@Coga19000]

Well, the shadows are not of real steel at all. The entire thing is just a shadow, so shadow steel if you will. They can be physically struck, so they are not totally reckless. Trouble is all that will happen is that after trashing the shadow it just returns to the owner. 

And yes, those shadow knives will still cut and hurt like a real knife. So ignoring the shadow will get you stabbed. Its a unique powerset, while it isn't superbly powerful in a direct way, its a threat in that it is something that can bring you down without the owner having to worry. 

Also....not sure how you think that device you are throwing is going to work. If a flashbang is all it took for the shadow to disappear an Illuminate could light up a room and pretty much kill every single Nightshade in a room.