This is all very different to my longboarding crash rules which were "slide. Rolling breaks limbs" mind you we were crashin much faster and wearing leathers or pads built for sliding...
My advice would be land on forearms not wrists, and don't highside. And get use to unclipping fast and leapfrogging over your bars.
FYI you can't "roll" and " hold your bars tight" at the same time and if you do your gonna get mangled.
Oh yea and DONT FALL