Currently the only known way to quiet a zombie is to bash their brains in. This is a task that is difficult as it is gruesome, and only slightly easier if aided by a shotgun. However, kyonshi can be sedated by tactically placing a small scroll with buddhist inscriptions on the forehead (as pictured above). Also, (and this helps in assisting the first objective) kyonshi are legally blind. They detect human presence from the smell of our breath, making a cornered escape realistically possible by simply holding your breath.
All good information to know heading into Halloween.