Vedantic Niddhihasana is based on Patanjali Yoga's techniques. The more selfless you are, the calmer your mind will be according to Karma yoga and Dhyanayoga. All four yogas are a powerful practice for maintaining composure in any situation. From an Advaitic perspective, what is Krishna doing here? He is giving us the methodology of Vedantic NiddHihasana using Patanjalis methods.