My father - A term of respect used by Jehoram in his joy at seeing an army of Syrians delivered up to him by the prophet. That the king’s character was not changed appears from 2 Kings 6:31-32.
Shall I smite them? shall I smite them? - The repetition of the words mean, “Shall I utterly smite them?” Compare similar repetitions with similar meanings in Genesis 22:17; Luke 22:15.