Let’s get to the point. Consider this as a tip if you find yourself trapped like me. when the radik reaches the kuman camp they stop moving. after killing the kuman commaner. scenario: npc/you/radzik will kill commander and create formations then freeze like dolls. you can run wild in the end mission faild. even if you try lure all bandits to kuman camp. magical wagon will block your way and you will die in terrible death or in middle of the way. game will tell you that you somehow lost, no reason -.- .
To Fix this you must. Must kill archers (optional) on stairs before commander dies. If you leave for later/last mambo jumbo scenario spins round and round. do not waste your time like i did. Supid quest.
Hope this will help you 
see ya