I haven't played the game, but from what I've seen it only moves towards you if it's not in your line of sight. However you only lose if you look directly at it(at a faster rate dependent on the distance between you and him) so you can either:

1) keep him in view in the side of your vision or
2) keep him directly in your line of sight, but behind an object like a tree

Second tip I picked up from a video.