Looked for, cannot be seen. Listened for, cannot be heard. Felt for, cannot be touched. The Invisible Fist gives no warning, nor can it be stopped. You cannot hide from it, nor can you escape it. Why is this so? Any decent self-defense class can teach one to draw up his courage in the face of danger, the better to execute one all-out, totally committed, do-or-die technique. This usually resu…