Second video on advance parrying. Using the outside parry with the lead hand from switch stance as bait, a typical response is to sit their weight down to defend or move backwards using evasive foot work. either one works as i use my lead front leg to ‘cut’ low kick. and not so much in a traditional chopping low kick style, but rather i wrap my whole instep around their achilles and use my foot to pull them off base and off balance. Once they are off base and off balance, i use that little window of opportunity to attack before they regain their composure and begin to guard or counter attack. That is what i call attacking within transitions.
I use the left kick as one example, but further in the video i also use different punches along with the kick. up to you, try it out and see what flavor suits you.