I see a chalk outline, perhaps a blood pool? - think it killed the person? I can see it being a hard enough hit that, without proper gear, it could do some serious damage.
One more reason not to follow the car in front too close. They probably didn't even see this until it was too late.
It's possible he died, If you think about how fast the front end dropped out and it probably slung the rider face first into the ground, if he had no helmet then it's very possible the outcome wasn't pretty