The blessings of Maa Baglamukhi make a divine protective protect in the shape of the aura all-around somebody therefore safeguarding him/her from malefic energies in the form of black magic spells or evil eye. Yet another etymology suggests that valga implies "to paralyze" and symbolizes the strength of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0