The Blessings of Maa Baglamukhi develop a divine protecting shield in the form of the aura about somebody thus guarding him/her from malefic energies in the shape of black magic spells or evil eye. One more etymology indicates that valga suggests "to paralyze" and symbolizes the power of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0