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