What does Jeremiah 48:45 mean?

People fleeing from Moab will collapse in exhaustion near Heshbon, because fire will come out from Heshbon, flames from Sihon’s city, burning up Moab’s leaders and destroying the people who brag so much. Jeremiah 48:45 - Modern Text Bible

(Even those who try to escape will be caught. The fire from Heshbon is a symbol of destruction that will reach Moab’s proud rulers.)