The blessings of Maa Baglamukhi produce a divine protecting shield in the shape of the aura all around somebody thus shielding him/her from malefic energies in the form of black magic spells or evil eye. A further etymology suggests that valga implies "to paralyze" and symbolizes the strength of stambhana, https://seozdirectory.com/listings13221587/5-simple-techniques-for-baglamukhi