Good health to you, hunter. The old chemical plant has a new menace to it. There's this new psycho, marauders call him Tagilla. And from what I've heard of him, I actually know him from back when I worked there. He worked in that factory, always tried to follow his brother's steps, wanted to surpass him in everything. They say he even borrowed the helmet idea from his brother. Ordered some experts to make his mask bulletproof. And apparently, the bullets really knocked his brains off, because now he's running around the factory with a sledgehammer, sending everyone to the heavens indiscriminately. Do a good deed, save him from his torment, once and for all. This is not the place for people like him on our earth. As proof, I need his red baseball cap. You know what to do, hunter.
It's best to try and do this quest with a friend, as doing this quest solo is quite difficult. If Tagilla is chasing a teammate, try and shoot him in the nape, as it is not protected. The boss cap doesn't spawn 100% of the time, so it might take you a couple tries.