if you're lucid dreaming your brain doesnt let you die as far as im aware, it just switches to you being on the ground looking at the person who just jumped
Last week I choose what to dream about and I quit from that dream because I wanted to wake up. How it's happen that I was thinking about walking in the city center before I was entering the sleeping state then when i enter the sleeping state I started to see that I'm in that city which I was thinking about before sleep, then i realized that I'm dreaming . I walked a little bit in that city then i got bored and forced myself to wake up.