Hare Krsna
Please accept my humble obeisance. All glories to Srila Prabhupada
After the battle of Kurushetra was over, Bhima had already killed Duryodhana who was the last survivor from the Kauravas. As they were returning back to home camp, Lord Krishna asked Arjuna to step down first. Arjuna declines. Krishna then forced Arjuna to get down first.
When Arjuna stepped down from the chariot, Lord Krishna followed him. As soon as Lord Krishna got down of the chariot, the hanuman flag disappeared and