What does 2 Samuel 23:20 mean?

Benaiah, son of Jehoiada from Kabzeel, was a brave man who did many heroic things. He killed two of Moab's best fighters. On a snowy day, he went down into a pit and killed a lion. 2 Samuel 23:20 - Modern Text Bible

(Benaiah is described as a courageous and resourceful warrior, famous for killing both enemy champions and a lion under tough conditions.)