The blessings of Maa Baglamukhi produce a divine protecting shield in the form of the aura all around an individual therefore guarding him/her from malefic energies in the shape of black magic spells or evil eye. Another etymology implies that valga indicates "to paralyze" and symbolizes the power of stambhana, https://connersjxnc.suomiblog.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-baglamukhi-51369741