>>12422507If your rocket has enough juice to pus you upwards then the new "height" you are falling from is the new crest of your fall, e.g. the highest point you en up after firing the rocket. If you die or not is dependant on how high that point is and if you can achieve enough speed to die again before you hit the ground.
As a result the optimal rocket would fire just before you land, bring you to a stop just bit above the ground alllowing for a soft landing. Too powerful rocket will kill your speed, send you flying up too high that allows you to attain kill velocity again. Too weak of a rocket will only kill your speed partially which might or might not be enough to save you.
