The Blessings of Maa Baglamukhi create a divine protecting protect in the shape of an aura all over somebody thereby safeguarding him/her from malefic energies in the form of black magic spells or evil eye. Yet another etymology implies that valga means "to paralyze" and symbolizes the strength of stambhana, https://www.youtube.com/shorts/5VeSyP9JRw0