Naaman went away angry because he expected Elisha to do what?

Answer: Come out and wave his hand over him

Naaman thought Elisha would come out, call on the name of the LORD and wave his hand over the spot, instead of just sending a messenger.

“Then Elisha sent him a messenger, who said, “Go and wash yourself seven times in the Jordan, and your flesh will be restored, and you will be clean.” But Naaman went away angry, saying, “I thought that he would surely come out, stand and call on the name of the LORD his God, and wave his hand over the spot to cure my leprosy.”— 2 Kings 5:10-11 (BSB)