Each range (Kicking, Punching, Clinching, Ground-fighting) in a self-defense situation may flow within its own limitations, techniques and strategies; and therefore we can assign a sense of continuity within each range. However, when we consider higher levels of the quality of Flow, it becomes apparent that it is best observed when a fighter can actually transition from one distance (range) to another with maximum efficiency-----and not necessarily transfixing the quality of continuity within a set domain or range in a fight, such as boxing or wrestling range.
I, wholeheartedly believe that this concept of Flow within the context of Transition and Continuity was one of the biggest principles that Sigung Lee was trying to convey to the close-minded martial artists of that time period. The message got through some people better than others. But it did have a positive impact on a lot of martial artists as well as some of the fighters of the time.
Continuity or flow should be looked at and systematically trained both within each range----- especially when something does goes wrong, as well as when a series of shots are rapidly and successively well-executed within several different ranges. In my estimation, it's always better to assume something WILL always go wrong at any given time, and now, you must ask yourself, what can you do, RIGHT FROM there without resetting your footwork, your range, and body-positioning. If you reorient your thinking and training like that, no matter what range your are in, then you most likely are on the right path and would have an easier time appreciating and understanding the concept of Flow, which is really a reflection of how well you transition from shot to shot and from range to range in order to maintain a sense of efficiency and continuity. That should really be running in the back of your head at all times, no matter what system(s) of martial arts or fighting you are training in.
Good luck
SHAHRAM MOOSAVI