2 Samuel 2:19 Meaning

17And there was a very sore battle that day; and Abner was beaten, and the men of Israel, before the servants of David.

18And there were three sons of Zeruiah there, Joab, and Abishai, and Asahel: and Asahel was as light of foot as a wild roe.

19And Asahel pursued after Abner; and in going he turned not to the right hand nor to the left from following Abner.

20Then Abner looked behind him, and said, Art thou Asahel? And he answered, I am.

21And Abner said to him, Turn thee aside to thy right hand or to thy left, and lay thee hold on one of the young men, and take thee his armour. But Asahel would not turn aside from following of him.