Nimrod tries a different tack than his fathers. Rather than fight against Shule, he appears to submit to him. As a result, Nimrod appears not only to retain control of his own lands, but he “did do in the kingdom of Shule according to his desires.”
Shule must be quite aged by this time. When he is dealing Nimrod he is dealing with the great-grandson of his brother, Corihor. Shule is probably seventy to eighty years old at this time.