It was not right to praise the adversaries in the battlefield that would demoralize the foot soliders . In Mahabharatha, the soliders of both camps were allowed to move freely in the nights. There were instances of soldiers attending parties of each other's camps.The next day, the very same soldiers fought vigorously showing no signs of mercy to each other. That was the code of conduct agreed by both Pandavas and Khavuravas.
By praising the adversaries you admit your inability simultaneously your praising would blunt your attacks. Never choose the battlefield for showering encomiums.
