This is DC member Kyle Evans showing us a progress report of a new technique he's working. In this clip Kyle is learning the "Gravity Blast Beat" which incorporates the use of the one handed roll. Here's what Kyle had to say from the original post:

Im still working on it, but i think im pretty good for just learning
it today. haha.

so yeah, they really aren't that hard once you know the technique.

if the video is off sync, im sorry. blame youtube.

Good job Kyle! I hope more are on the way!