He contains peaceful as well as wrathful forms. Unable to bear the scale of the sight and gripped with fear, Arjuna requests Krishna to return to his four-armed Vishnu form, which he can bear to see
This deity manifests both soothing and fierce qualities, causing Arjuna to feel daunted and intimidated. Consequently, Arjuna implores Krishna to transform back into his more manageable four-armed Vishnu form.