The blessings of Maa Baglamukhi make a divine protecting shield in the form of the aura all-around somebody thereby guarding him/her from malefic energies in the form of black magic spells or evil eye. Yet another etymology suggests that valga means "to paralyze" and symbolizes the strength of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0