You are on a salt flat, away from the city lights, no moon and it is cloudy. It is pitch black, you cant see a thing. It is a salt flat so there is nothing for miles. You shine a torch so the beam hits a hundred meters in front of you onto the ground. If the light is travelling away from you at 300 kps and there is nothing to bounce off,back to the observer, then how can you see the light? Do the same with a laser, 500 metres, how can you see the point where the laser hits the ground, when it is travelling away from your eyes, and in a focused beam?