Here is a guide/glitch on how to defeat the lambent berserker on insane difficulty in the Gears of War 3 campaign. I figured with Gears of War: Judgement coming soon I would make a guide for everyone finishing up Gears 3 on insane . I will make more guides on Gears of war 3 insane, a final boss guide with different methods soon. Skip to the 4 minute mark to skip the first checkpoint and intro to go right to the glitch. Wow sorry about the bad quality. Bad quality but I hope it helps, if it does hit the like button!