Use your arms to absorb the impact, roll into in, tuck you head under and roll your shoulder into it.
Basically you are trying to a) reduce the impact by absorbing some force, b) protect your head, and c) minimise the change of speed by rolling it out.
So, stay loose and flexible – not ridged with fear 🙂 Tuck and roll to disapate the speed and spread the load.
If you just try to use your arms you will break something. Rolling can put you back on your feet.
Mid jump bail outs often end up with you running out the crash which is fine.
Its the crashes that come out of nowhere that you cant see until you hit the ground. Not much you can do about those, but for those slo-mo ones where you think you can save it but cant, or where you bail out mid jump you can have a chance.