Then the angel of the LORD put forth the end of the staff that was in his hand, and touched the flesh and the unleavened cakes; and there rose up fire out of the rock, and consumed the flesh and the unleavened cakes. Then the angel of the LORD departed out of his sight. The angel - put forth the end of the staff - He appeared like a traveler with a staff in his hand; this he put forth, and having touched the flesh, fire rose out of the rock and consumed it. Here was the most evident proof of supernatural agency.
Then the angel - departed out of his sight - Though the angel vanished out of his sight, yet God continued to converse with him either by secret inspiration in his own heart, or by an audible voice.