One thing that is important to fighters, especially like Indonesian fighters, etc. is to have their "spirit" come through their eyes. What I interpret they mean by that is to project their intensity thru the eyes. When you fight, you should be looking directly at your target, so on a groin shot you should be looking down, etc. When striking in the face, or throat you should make full eye contact with the target. Project your anger, intent, intensity, like if you were burning a hole through your target. I personally think the eyes should show. I don't know why the eyes should ever be covered except if he is using tear-gas, pepper spray, or any other chemical agent that affects vision.