The blessings of Maa Baglamukhi produce a divine protecting protect in the form of an aura all around somebody thereby protecting him/her from malefic energies in the form of black magic spells or evil eye. Another etymology suggests that valga signifies "to paralyze" and symbolizes the power of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0