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