What does 2 Samuel 2:22 mean?

Abner warned Asahel again, 'Stop chasing me! Why should I have to kill you? How could I ever face your brother Joab if I did?' 2 Samuel 2:22 - Modern Text Bible

(Abner doesn't want to kill Asahel, knowing it would cause trouble with Joab, but Asahel won't listen.)