Guys, it is as simple as NOT jumping off the cliff coz it will break your legs and that is the least that can happen. There is no point in calculating the force of hitting the ground and drawing any conclusions whatsoever..,.....simply DO NOT jump off the cliff.
WinISD, though is a great sim tool and props to the developers, but it does not show the effect of slot vs round ports on SPL. Slot ports simply reduce SPL near the tuning frequency due to the reason I explained earlier. It is simple fluid dynamics.
If slot ports carried any greater merit, Beretta would make rectangular muzzles to increase muzzle velocity