Ancient Urartian site of Çavuştepe [OC]

Çavuştepe is the ancient Urartian fortified site located near the village of Çavuştepe, Van Province in eastern Turkey. Officially dated to 8th century BC.
I've posted 20 pics of the site itself and the surrounding locale.
Take a look at the (IMHO) interesting damage of the stones in the first and second shots. The guide that was with us said that it was fire. I would think that fire damage would be a bit more widespread than this. Would be good to understand what would damage just a few stones like that while leaving the surrounding stones intact.