im having trouble visualizing this situation.
If your hitting a jump in the park, and don't see the rider ride away after why would you hit the jump? Clearly that person is still there.
Also if you know someone is droping right after you, why would you walk around and pick up your stuff?
Im not trying to lay blame, but i think this a good situation to show how important good communication is, espically in a backcountry setting. Be clear as to what your going to do. Espically if your filming, i mean someone caught this on camera? and had no way to tell kye not to go?
It's not that hard to carry a small 2 way radio, it's no bigger then a ipod, and not that expensive. And this could easily increased good communication, and may have prevented the problem.
You might find they are handy for a bunch of things, not just warning people, and are super handy while filming and setting up shots.
I hope CR recovers fast, and doesn't come out with any perment damage, tragic accident. Mistakes DO happen.
Lastly, wearing a helmet is a good idea, espically since there are a ton of models out there that actully look good, are comfortable, and come with ear phones. Oh and reasonbly priced. (I don't think i have ever heard a parent say no into buying there child something that could save there lives)
But it is a personal choice, i know lots of people that are just dead against helmets, and don't like them. I wear mine everytime i ski, and when i ride with people that i really care about, i mention it everytime we ride, cause im a stickler.