And he went up and down among the lions, he became a young lion, and learned to catch the prey, and devoured men.
And he went up and down among the lions - imitated the recklessness, oppression, injustice, covetousness, and tyranny of the surrounding kings (Jeremiah 22:13-17).
And learned to catch the prey - to do evil, gratifying his lusts by oppression (2 Kings 23:17).