How to use random proportional editing? https://ibb.co/fvjwCjf I'd like to have the orange line randomly peaking downwards. In this case, it only made the faces above it random. I'd also appreciate some further tips on (random) edge editing.
The Proportional editing only affects vertices in the circle of influence (Scroll wheel to resize)  




The default cube is subdivided and I selected a single vertex. Then with the Proportional editing set to random Grabbed and translated on the X axis. Note which vertices are affected.



Then I selected more vertices and repeated the process. Note which vertices are affected now.

I also tried it on a Mesh Circle and the same results occured. I did have to make the circle of influence very very big to affect all the unselected vertices in the circle. 

In the video you cannot see the circle of influence, I am guessing it is so big it is off the edge of his viewport.