This is one of the boons for which Bagalamukhi's devotees worship her. Other Mahavidya goddesses also are claimed to symbolize identical powers beneficial for defeating enemies, to get invoked by their worshippers by several rituals. A further etymology suggests that valga indicates "to paralyze" and symbolizes the strength of stambhana, https://elliotdukzp.theisblog.com/36746007/mantra-an-overview