Through collected references from rare book collectors and old ashram libraries, here is a general outline of the rumored contents of the genuine Lightning Standing Still manual:

To examine the intersection of intense spiritual energy and profound inner silence in Babaji’s teachings. 2. The Symbolism of "Lightning" (Energy)

This is not metaphor. Practitioners who claim to have studied the PDF describe techniques that slow the heart rate to near zero, suspend the breath for minutes or hours ( Kevala Kumbhaka ), and force the spinal lightning ( Kundalini ) to stand still at the crown chakra.