How do you see the laser? It’s light no? Think about it, how could you see light that’s not bouncing off anything and isn’t going into your eye (or camera),(reply>), Its the light reflecting and refracting off the air and particles in it, you can see the same with a relatively weak green laser too,(reply>), It's true, they might have added some dust/smoke to the air for better visual effect.<br>   The guy does this for a living, after all.