This is a tacticle fight as it's a shoot and hide fight when you first start, run to the right following round the block in the middle you will see hollister between to rocks use the rock on the right to hide behind as hollister comes running over to you shoot him and run round the rock as he comes into view shoot again repeat this and he will soon die, be carfull when doing this though as he sometimes changes the direction he runs in and comes round the opposite way.