The rate that an object falls is determined by two factors, gravity and air resistance, which is determined by the mass and shape of the falling object. This was very visually proven during one of the moon landing missions when an astronaut dropped a hammer and a feather at the same time. They both hit the ground together.
A skilled sky diver, and all Special Forces are that, can manipulate his/her body to attain very high terminal velocities. However, the maximum possible terminal velocity decreases as altitude decreases. This is because the air is thicker at lower altitudes and thus more resistive to a body falling through it.
I did see a problem with this scene that would affect whether or not Capt. Doyle could catch up with Bo Tat. Bo Tat managed to stay fairly stable and keep the bottom of the platform under him. This effectively increased resistance and decreased terminal speed. I think that, in a real situation, the platform and Bo Tat would have tumbled quite a bit and would have had a higher velocity than with a stable platform.
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