The Blessings of Maa Baglamukhi make a divine protecting shield in the shape of the aura about an individual thus safeguarding him/her from malefic energies in the shape of black magic spells or evil eye. One more etymology indicates that valga suggests "to paralyze" and symbolizes the power of stambhana, https://www.youtube.com/shorts/5VeSyP9JRw0