I know an arrow can kill quicker than a bullet. The arrow broad head has to be razor sharp and cleanly cut the main artery to the brain. A clean cut the artery collapse straight away and zero blood pressure to the brain straight up. For this to happen the archer has to know exactly where to hit and be totally capable of doing this. The broad head has to stay razor sharp until it cuts the artery. No foliage in the arrow path.

So all the planets have to align for this to work. This is why, to me, the PH should be shooting the moment the buff moves away from or toward the them. Hell even when the hunter is using a rifle if the buff moves toward the group I would want the PH to shoot.