According to Isaiah, God feels very sad for the people of Moab and knows they will run away to a place called Zoar. Along the way, they will be crying because they are very scared and everything is broken.
Isaiah 15:5: My heart shall cry out for Moab; his fugitives [shall flee] unto Zoar, an heifer of three years old: for by the mounting up of Luhith with weeping shall they go it up; for in the way of Horonaim they shall raise up a cry of destruction. [his...: or, to the borders thereof, even to Zoar, as an heifer] [destruction: Heb. breaking]
This verse advises not to rejoice at your enemy's downfall, which seems to contrast with Isaiah 15:5, where the sounds of distress are described, potentially implying the Moabites' suffering could be observed by others.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth: