Albert Barnes Commentary 2 Samuel 2:21

"And 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 armor. But Asahel would not turn aside from following him." — 2 Samuel 2:21 (ASV)

His armour - Rather, as in the margin: that is, be content with the spoil of some inferior soldier for a trophy.