Make sure you understand how to get into Lapel Lasso guard.
Weave their lapel under their far leg to complete the transition, and then spin all the way around, 180 degrees, into reverse X-guard.
Once you hit the sweep, you can disengage and come up into a leg drag pass.
Alternatively, instead of spinning all the way around, you can stop and take the back, like this:
This is similar to the back take finish from Reverse De La Riva guard.