The Chief of the Dwarf Village is not narrow-minded with the other races, but he underestimate humans ability.
During the Toran Liberation War, when Tir McDohl, Kirkis and Valeria went to the Dwarf Village to asked for help they told that Kwanda Rosman is planing to burn down the forest and the blue print of the Burning Mirror was stolen by human. At first he doesn't believe that human can stole the blue print of the Burning Mirror, but after Tir McDohl and his party had successfully breaking into Dwarven Vault and steal the Running Water Root out from Dwarven Vault, he believed their story and prepared the Firewind Cannon right away.
After Kwanda Rosman's army was defeated, he planned to destroy the Liberation Army by using the Burning Mirror. The Liberation Army disperse to reduce the casualties of the Burning Mirror and before Kwanda Rosman used the Burning Mirror the Chief of the Dwarf Village came and used the Firewind Cannon to destroy the Burning Mirror.