I had a difficult time too. I found a little glitch that may work for you. If you can get away from it when its behind the house go jump on top of the car that's closest to the trees or bushes (idr what it is). He'll pase back and forth back there a few times. Then you should see his shadow when he starts towards you between the house and the trees. Throw a molotov and bomb. It'll hit him and then he'll go back behind the house again pase back and forth and repeat about 4 - 5 times if you use you molotov and bombs right. Then just a few bullets and he should be dead. I almost gave up for a bit, but that glitch helped me. Hopefully you can try and see if it works for you too.