In reply to Trangia:
> It makes you wonder how people can anticipate these collapses and get their cameras set up and rolling just at exactly the right time?
The biggest rockfall I've ever seen (house-sized amount coming down in Dinorwig in Australia, onto the scree pile on the col) had bits and pieces coming down all day, with lots of smaller falls before and after the bigger falls. In the video it looks like small stuff is coming down when the video starts.