That dragon(not really a dragon, at least according to the MC) is not affected by 'flirting'. I tried to defeat it with the power to manipulate time, (also known as save scumming lol) but after a reaching a certain health threshold, exactly at 2200, the battle ends suddenly with the Eyvind spotting an opening and escaping, leaving Behir complementing the Mc being cunning while also saying that they will meet again.