The custom of those guhya or secretive Bhairava can be an oral tradition that is continuous from the guru disciple tradition. Their karmakand rituals and methods are mystery, they don't seem to be created down but only learnt and practiced in Expert disciple tradition. Amidst the chants of hymns as https://vashikaran00865.pointblog.net/the-smart-trick-of-bhairav-that-nobody-is-discussing-71542077