The Blessings of Maa Baglamukhi produce a divine protecting shield in the shape of an aura around someone thereby preserving 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