It makes no sense that someone would intentionally turn off a camera when they tripped/fell and then turned it back on.
It would be like.....
"Oh, my. I've tripped and am now falling. I think I'll turn off the camera until I can regain my balance and obtain proper footing on this uneven surface I find myself running across."
"Ah! Much better! Now that I once again have firm footing and can stand without fear of falling again, I think I'll turn this camera back on so that I may continue to film the local fauna."
Now, I'm not familiar with ancient filming technology so if the camera has a trigger/button that needs to be held down, I could see the film stopping as the person falling down tries to catch themselves and the finger comes off the trigger/button/whatever.
If the camera has a toggle/flip/other switch, it COULD have been engaged while the person was falling - if that switch is located near the fingers - and the person was trying to catch themselves on the way down.
Now, with all the buttons on video cameras nowadays, you can probably sneeze and hit 4 buttons at once - lol. What would the situation have been like for these guys?
Anyone have a good pic of the camera's on/off switch? (from an old ad, publication, instruction manual, etc.)