Haftarah Ki Tisa Part Four

“Elijah said, 'As God, Master of Legions, lives, before Whom I have stood, today I will appear to him!” Why does Elijah refer to God in this statement as “Master of Legions?” Why does he insert the phrase, “before Whom I have stood?”
Haftarah Ki Tisa Part Ten

“They took the bull that he gave them and prepared it, and called out in the name of the Baal all from the morning until noon, saying, “O Baal, answer us!” But there was neither sound nor response, and they danced by the altar that he made.”