When jetpack / rocket belt users are in flight, the nozzles presumably exhaust large amounts of super-heated air under high pressure straight down to create an upwards lift force.
Now I'm no scientist, but surely a force that's going to be enough to lift a human off the ground will also be enough to heat/burn anything close to it? If this is the case, then how come the user's feet, dangling centimeters away from the exhaust nozzles, remain un-scathed?
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