Here is just a good video I came across. Although the guy is not actually Cobrinha, it is indeed a move done by him.
The guard pass goes straight into the back mount, which is something I noticed that is very common amongst high level athletes. (In any grappling art).
i recall reading one time in an article written by Lloyd Irvin that transitions are something that can be practiced to the point where someone with less experience can beat a far more experienced person simply because he is beating them with transitions.
Now the video: