What does 2 Samuel 18:22 mean?

Ahimaaz spoke up again, 'No matter what, let me run after the Cushite.' Joab said, 'Why do you want to do this, my son? You won't get any reward for it.' 2 Samuel 18:22 - Modern Text Bible

(Ahimaaz insists on running, even though Joab warns him there's nothing to gain and the news is hard.)