Here's the Bible passage (from Luke) about baptism by water and fire. Beside the fact that there was a baptism and a fire in this episode, I'm having trouble drawing a connection between the passage and the episode. Maybe there isn't one, or maybe I'm just sleepy.

15The people were waiting expectantly and were all wondering in their hearts if John might possibly be the Christ. 16John answered them all, "I baptize you with water. But one more powerful than I will come, the thongs of whose sandals I am not worthy to untie. He will baptize you with the Holy Spirit and with fire. 17His winnowing fork is in his hand to clear his threshing floor and to gather the wheat into his barn, but he will burn up the chaff with unquenchable fire."

tsimer, you must not be Catholic. I'm not, either, but Eko is, and I know that the Catholic church's ideas about baptism are far different from Protestants.