A powerful disturbance is moving through the flame, leaving a linear trail in the light, like a cosmic ray fired through a cloud chamber. By the force of its passage, it leaves behind a shock wave that is clearly visible in the flame, a bright spreading cone that is a hundred times larger than the dark source at its apex: a black bulletlike thing supported on four legs that are churning too fast to be visible. It is so small and so fast that L. Bob Rife would not be able to see it, if it were not headed directly for him.