As the person who sharpened the tool shown, I feel it is my duty to warn you of a particular situation that may result in a wound like the one in the photo. It is important to remember that when yanking on plant material, that when that material comes loose, the grasping arm may suddenly fly backwards. If your other hand is holding a sharp object, that object may come into contact with said arm, resulting in skin penetration and a leaking of bodily fluids. To that end, please use extra caution when using one of the tools I have so thoroughly honed. It would ease my mind if you would create a first aide station in your back yard that would include a lot of bandages and perhaps a tourniquet.
Stan, The Concerned Man