The Blessings of Maa Baglamukhi make a divine protecting defend in the shape of the aura about someone thereby shielding him/her from malefic energies in the shape of black magic spells or evil eye. Yet another etymology suggests that valga usually means "to paralyze" and symbolizes the strength of stambhana, https://www.youtube.com/shorts/5VeSyP9JRw0