Amasa took no heed to the sword Which, falling out, as it seemed, casually, he supposed that Joab intended only to put into its scabbard, and therefore took no care to defend himself against the stroke. So Joab and Abishai pursued after Sheba He boldly and immediately resumed his former place, and marched at the head of the army. It may appear strange that Amasa's soldiers did not attempt to revenge his death; but it must be observed that not many of them were yet come up, as the following verses show, and Joab's interest and authority with the military men were very great, especially with David's guards, who were here present, and who had neither confidence in nor affection for Amasa, as having been the general of the rebellious army; and, as they probably thought, not fit to be put into a place of such great trust.
Related Commentaries of 2 Samuel 20:10
2 Samuel 20:10
10 But Amasa took no heed to the sword that was in Joab's hand: so he smote him therewith in the fifth rib, and shed out his bowels to the ground, and struckd him not again; and he died. So Joab and Abishai his brother pursued after Sheba the son of Bichri.