The blessings of Maa Baglamukhi make a divine protective shield in the form of the aura around a person thus shielding him/her from malefic energies in the form of black magic spells or evil eye. A further etymology indicates that valga signifies "to paralyze" and symbolizes the strength of stambhana, https://www.youtube.com/shorts/5VeSyP9JRw0