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Now, let's say that Mr. Spy is right, and the nozzles do move. And, in turn, when he wants to move backwards, the thrust nozzles angle towards him. Now, let's throw in some math: Boba, a well-muscled man who's been fighting almost non-stop his entire life (+ his armor and weapons), must weigh in at at least 200 pounds, almost definitely more. Now, given the speed at which the jetpack carries him, let's mulitply that by...2? 5? 7? That's at the very least 400 pounds of thrust; and if Spy is right, that means 400 lbs. (with the addition of temperatures exceeding a few hundred degrees) of pressure exerted directly onto the back of his legs. Assuming that he's still a 200 pound lightweight, those 400 lbs. could easily become 1400, nobody knows for sure what the exact statistics are.
What I am sure of however, is that 400 - 1400+ pounds of thrust, plus the addition of hundreds of degrees in temperature, applied at close proximity to Boba's or Jango's lightly-armored legs (in fact angled at the appendages themselves), would be enough to have them walking on toothpicks.
Check and mate.
"I AM A SEXY SHOELESS GOD OF WAR!" - Belkar