2 Kings 6:15 And when the servant of the man of God arose early and went out, there was an army, surrounding the city with horses and chariots. And his servant said to him, “Alas, my master! What shall we do?” 16 So he answered, “Do not fear, for those who [are] with us [are] more than those who [are] with them.” 17 And Elisha prayed, and said, “LORD, I pray, open his eyes that he may see.” Then the LORD opened the eyes of the young man, and he saw. And behold, the mountain [was] full of horses and chariots of fire all around Elisha.
The key words here is “Elisha Prayed” (note: this is different from “Elijah Prayed”). Elijah and Elisha are two different men of God, both who know the power and ability of prayer.
Notice here in 2 Kings 2:9 And so it was, when they had crossed over, that Elijah said to Elisha, “Ask! What may I do for you, before I am taken away from you?” Elisha said, “Please let a double portion of your spirit be upon me.”
So Elisha prayed “Open his eyes”. Notice he did not pray for power but just to see what God had already done and what God was about to do. The Lord God had angels taking care of the seemingly impossible situation.