Do you know how to shoot a thrilling scene of a fight on the top of a train? physics

1. Shoot the fighting scene on the top of the stationary train in the studio. In addition, the scene of the rapid retreat of the bullet train a year ago was filmed, and then two parts were synthesized by computer, and finally dubbed.

2. The duck in the middle of the picture is dancing, and the cliff and other scenery in the background are moving up rapidly, giving the audience the illusion that the cliff is motionless and the duck is moving down.