User blog comment:Morrigan1993/adam tips?/@comment-4694083-20131116153030

He's hard to defeat until you're a higher level, but it's so worth it for the small chainsaw. It destroys.

The strategy I used is kind of slow. I take a gun in with me. When he's far enough away, he'll start to blow up a gas balloon. You can shoot the balloon when he's blowing it up to stun him, then move in and do some damage with a melee weapon. If you shoot at him at any other time, he'll deflect the shots, so don't do that! There are also some strategies on  his page here on the wikia if you don't think that strategy will work for you.