Arjuna cannot behave cruelly as his mind never entangles in coming vice. He cannot abandon his religion even if enticed for ruling on trio-worlds. This is the reason, he did not killed us at that unconscious state. O one of pioneer warriors in Kuru race, go back to Kuru state immediately. Let Arjuna return to his destination with cows. Keep in mind your own interest and don't become cause for defeat of your own purpose. All of us should do whatever may ensure our welfare.