The blessings of Maa Baglamukhi develop a divine protective shield in the form of the aura about someone therefore safeguarding him/her from malefic energies in the shape of black magic spells or evil eye. Another etymology implies that valga usually means "to paralyze" and symbolizes the power of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0