Here is another example-Josep Traver Crosspicking Forward/Backward Roll it gives more sense of how it fits in--

One thing that may help, (or possibly confuse you even more)--this, a bottom, is a jazz rhythm--very close to "In the Mood"--It is a kind of "Time Step" for bluegrass, and the "rest" at the end of the phrase essentially allows you to shift weight back to where it needs to be to begin the phrase.