The tendency to insert Hebrew Words to portray professional knowledge of Krav Maga caused the word Retzef to be recognized in the Krav World.
For the purpose of future reference I choose to mention another Hebrew word called "Seria!" Seria or series in English, is a terminology of a chain of items of a like kind. In Krav World that could be pertained to just blows or just kicks I guess.
While there is some truth in every idea there is just not enough truth to use retzef as the main teaching of Pure Krav Maga!
The Hebrew terminology in Krav Maga was to describe execution of continuous blows and kicks. Some people take it wrong assuming vaguely that if they keep beating up the opponent without letting them breath and therefore can win. This is true as long as he does not block the first strike and counter.
The assumption is that combining many small blows could have an accumulated devastating effect or at least an overwhelming continuous attack that does not let your opponent come back at you.
If you take a look at the ancient disgusting custom of stoning to death, it appears that little rocks cause cuts, pain and injury, but then someone comes with a bigger rock for the finish. Now lets say you hit someone in the chin twenty times fast. During the punches that he is standing, you just did not put enough impact force -When he fell, it was because that time you did!
Of course it is possible to his someone many times and at some point he might collapse. But you must question yourself whether or not it might have been due to a burst of blood in the brain or internal organ that was building up slowly from a previous blow.
More strikes indeed increase the potential of having a good hit. But at the same time you waste time and increasing your chances to be exposes to counter attack.
In the boxing world a similar terminology is called combinations. Even good boxers used this tactic a lot by hitting their opponents arms and elbows to delay their reaction and then hit them in the face.
You can’t build your attack on this unless your opponent is closing himself up. If he does that then he has no defense! A combination could target available points of attack first, creating pain, distraction, and collapse, facilitating reach on to the next pressure point which might give better control.
Continuous attack also gives a good opportunity to modify Knock Out punches to less severe strikes suitable for sparring and show controlling your opponent without injury.
Otherwise he can block and counter the first strike of your continuous attack. Therefore it is much better to stop after each one of your attacks and plan the next according to when your opponent moved or his response to the first one. You can only fit three attacks in less than a second anyway.
Assuming you are attacking your opponent limb or a weak pressure point first, you have time to move up for the next one. This could be planned.
However to assume and practice endless series of kicks and blows combinations to slowly wear down your opponent is totally foolish idea. Just bursting in and using a Retzef, Combination, or whatever, can be easily stopped at its inception with a deflection and counter attack.
The question is who got distracted first and who was able to maintain this distraction until the dropping blow!