Now Absalom was riding on his mule when he met the servants of David, and as the mule went under the thick branches of a large oak, Absalom’s head was caught fast in the tree. The mule under him kept going, so that he was suspended in midair.
Here is Absalom quite at a loss, at his wit's end first, and then at his life's end. He that began the fight, big with the expectation of triumphing over David himself, with whom, if he had had him in his power, he would not have dealt gently, is now in the greatest consternation, when he meets the servants of David, Sa2 18:9.
Commenting on 2 Samuel 18:9-18
And Absalom met the servants of David,.... When his army was routed, he was in such a fright that he knew not which way to flee, and instead of flying from David's men, he fled in the way of them; but none of them attempted to slay him, nor even to stop him, but let him pass by them, knowing David's charge concerning him: and...
Absalom met the servants of David--or was overtaken. "It is necessary to be continually on one's guard against the branches of trees; and when the hair is worn in large locks floating down the back, as was the case with a young man of the party to which I belonged, any thick boughs interposing in the path might easily dislodge a rider from his seat...