The blessings of Maa Baglamukhi make a divine protective protect in the shape of the aura close to an individual thus shielding him/her from malefic energies in the form of black magic spells or evil eye. Another etymology suggests that valga signifies "to paralyze" and symbolizes the power of stambhana, https://mpowerdirectory.com/listings769031/baglamukhi-an-overview