“Elijah said to them. ‘Seize the prophets of Baal. Don’t let one of them escape!’ Then they seized them. Elijah brought them down to the Wadi Kishon. They killed them there.”
To the victorious belong the spoils. Having shown the superiority of Yahweh over Baal, Elijah added insult to injury. He had all the Baal prophets killed near a brook so that their blood flowed into the Wadi Kishon. That was some sacrificial contest. Winners take all! Loser dies!