The blessings of Maa Baglamukhi create a divine protecting shield in the form of the aura all-around someone thereby safeguarding him/her from malefic energies in the form of black magic spells or evil eye. Another etymology indicates that valga means "to paralyze" and symbolizes the power of stambhana, "paralysis" that https://www.youtube.com/shorts/5VeSyP9JRw0