Here is my Sifu Greg LeBlanc doing a demo with my kung fu brother Tyler.
It is MUCH harder to pull moves like these off smoothly, with power, and yet not accidentally hurt your partner. Greg is showing amazing control here. Look how close his hand gets. His control of the range is instinctive.
In a real fight, Greg would always be stepping in, taking position, and this would multiply the force substantially, as Greg put as much of his body weight as possible behind each clear briefly uncontested opportunity or angle.
He feels the opening and his attack (Lat Sau Jek Cheung) springs forward. If the hand goes far enough, he brings the body along, as the hammer to pound that nail. And then if possible, he chains his grounded attack into that gap, that gate that was left open (or forced open). He attacks on that angle as long as it remains uncontested.
That is, as long as there is no counter-attack, until the situation changes. Either the opponent mounts a counter-attack or they are knocked out.
If the opponent counters, then we find another opening. We pursue another line of questioning, as they say.