In 1200, he helped a brother of Toghrul, a Kerait prince Jaqa Gambu (also known as Kereyidei), who fled to Tayang khan.

Seeing the once powerful Toghrul's defeat, he decided to act against Genghis first against council of his khatun Gürbesu and general Sabraq.

In 1203, he tried to reach Alaqush Tegin of Ongud, a fellow Nestorian lord ruling north of Shanxi[4] to march on Genghis together.

Naiman patrols investigated the large number of fires and informed Tayang.

Tayang consulted his son Kuchlug about the next step, advising a retreat and a guerrilla war.