The Blessings of Maa Baglamukhi develop a divine protecting protect in the shape of an aura all-around a person thus shielding him/her from malefic energies in the form of black magic spells or evil eye. A different etymology indicates that valga indicates "to paralyze" and symbolizes the power of stambhana, https://www.youtube.com/shorts/5VeSyP9JRw0