So Arjuna appeared to be illusioned that "How I shall fight with my brothers and grandfather on the other side?" He became so much illusioned... Taṁ tathā kṛpayāviṣṭam (BG 2.1). He became illusioned not unnecessarily. He was very much compassionate, compassionate with his family members. Kṛpayāviṣṭam, aśru-pūrṇākulekṣaṇam (BG 2.1). And he was crying. There was tears in his eyes. Viṣīdantam idaṁ vākyam. And he was lamenting in this way: "How shall I fight?" So Kṛṣṇa then began to speak. Kṛṣṇa saw that "My friend, Arjuna, has become too much illusioned." So He wanted to kill the demon of illusion. Therefore He's mentioned herein as Madhusūdana.