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