the boss in chapter 1:the fortress
 

does anybody has tips on how to deal with the boss when yo have to deal also with burning soldiers?

bacano: You need to shoot the boss until his health running out...first, u go to hide at one of the building, and you will see the boss...you try to shoot...after his health bar very low, you must closer with him and a nice cutscene will appear....

You can kill the zombies to reduce the wizards health.