The blessings of Maa Baglamukhi develop a divine protecting defend in the shape of the aura all over somebody therefore preserving him/her from malefic energies in the shape of black magic spells or evil eye. Another etymology indicates that valga suggests "to paralyze" and symbolizes the strength of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0