The blessings of Maa Baglamukhi develop a divine protecting defend in the shape of the aura about somebody thereby protecting him/her from malefic energies in the form of black magic spells or evil eye. An additional etymology implies that valga signifies "to paralyze" and symbolizes the strength of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0