When they were at the large stone which is in Gibeon, Amasa came to meet them. Now Joab was dressed in his military attire, and over it was a belt with a sword in its sheath fastened at his waist; and as he went forward, it fell out. Joab said to Amasa, “Is it well with you, my brother?” And Joab took Amasa by the beard with his right hand to kiss him. But Amasa was not on guard against the sword which was in Joab’s hand so he struck him in the belly with it and poured out his inward parts on the ground, and did not strike him again, and he died. Then Joab and Abishai his brother pursued Sheba the son of Bichri. (2 Samuel 20:8-10 NASB)
There are times that I really wish the Biblical writers had included more detail. Then there are times, like here, where they include a lot of detail, and it doesn’t help; I still don’t get it. This used to bother me, but the more I read commentaries, I realize we all struggle imagining just what happened here. In addition to the few things we surmise, there are a few things we actually know.