two enemies brought together by 'mischance'
a series of 'mischances'
(..) Here had we now our country's honour roofed, were the graced person of our Banquo present, who may I rather challenge for unkindness than pity for mischance. His absence, sir, lays blame upon his promise. What is't that moves Your Highness? - Which of you have done this? (..)2015 Macbeth