Keep in mind the atmospheric pressure at that altitude is just a tiny fraction of what it is at sea level. Terminal velocity changes with the shape of the object falling and air density. With almost no air molecules putting up any resistance he can easily fall faster than the speed of sound. It's all about air density. Pilots that have ejected from planes at near supersonic speeds have been killed or badly injured, but that's because the air density where planes fly is much higher.
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