String walking works well if the target doesn't move because the string walker sets up for a shot at a specific distance. However, if the target moves, and most animals do, it changes the distance from the shooter. Then the string walker has to start holding high or low on the target, sometimes continually changing as the animal gets closer or further away. Some make it work. Most don't. It's a very methodical way of shooting that doesn't work as well under conditions requiring a faster shot/release at variable distances.