Mark 6:22
When the daughter of Herodias came in and danced, she pleased Herod and his dinner guests. The king said to the girl, ask me for anything you want, and I'll give it to you — the daughter's dance and Herod's extravagant promise set the mechanism in motion. The dancing pleases Herod enough to make him reckless: ask me for anything you want. The blanket promise made in front of the powerful witnesses is the trap Herodias has been waiting for. The girl's dance is the occasion; the promise is the mechanism; John's head is the predetermined outcome of the evening.