That he may see; that by some visible appearance he may see the invisible guard of angels which encompass and defend us.
Chariots of fire; which is useful, both for defence to those that are surrounded by it, and offence to the enemies who shall attempt to break through it.
Round about Elisha: either the mountains were round about the city, and therefore round about Elisha, who was within it; or he saw in a vision Elisha upon the mountain encompassed with fiery horses and chariots.