PLF has saved me from a few rough situations on a number of occasions.
I was just behind and to the side of a jumper 2 years ago who on a real hot day hit the same turbulence I did.
She went down legs akimbo and broke one, I PLF'ed and walked away, bit of a grass stain on my leg.
Although some people might be agile enough to triple flip with pike and stand up a landing. A PLF was designed to be the simplest way to spread out contact with the ground back in the days of round chutes where every landing was a thumper.
PLF - requires
Legs slightly bent and springy - locking the leg puts all the initial impact in that small period of time of first contact with the ground
Feet together - so the initial impact is spread to both Legs. Landing on one leg doubles the shock to that leg
Toes up - so the heels hit first and not the toes which will break easier and also means they wont catch dragging on the ground and bust the ankle.
Feet are angled to direction of ground motion so the roll is sideways w.r.t. the foot. - hence the foot,ankles do not catch and break the ankle.
The roll now starts from the bottom side of the leg smoothly up to the hip as the legs bends.
When your hip contacts the ground, back should be piked so the roll goes across the hips to flip the legs over and the otherside of the whole leg thumps the ground. - This saves your spine and head from taking impact.
So to recap
heels together, Legs bent and toes up.
Hit and roll.
AND Thats a PLF, My first 55 jumps were PLF'ed under a round canopy that gave you a good solid whack to the ground.
P.S. A PLF is of course accompanied by flying the canopy all the way to the ground.
No, Not without incident