What does 2 Samuel 18:9 mean?

Absalom happened to run into some of David's men. He was riding his mule, and as the mule went under a big oak tree, Absalom's head got caught in the branches. The mule kept going, and Absalom was left hanging in midair. 2 Samuel 18:9 - Modern Text Bible

(Absalom gets trapped by his own hair or head in a tree, left helpless and exposed. It's a dramatic and ironic twist for the rebel leader.)