Because the statements are simple and able to be assessed on their own merits.
I asked earlier "If the player had juggled, dived, caught, rolled and popped what then?"
In both circumstances the ball did
not touch an opponent or the ground (my main indicator) before it was played backward. How small do you want to be able to resolve so that you can determine what was a flip or a slap or a pop and what was a pass?
Was the ball in the possession of the attacking team?
Possession: An individual or team in control of the ball or who are attempting to bring it under control.
It doesn't say if it must it be caught and held for fractions of a second, a whole second or multiple seconds. We don't put a time limit on passing, on the contrary we praise quick hands, the slight adjustment sideways to hold the defender coupled with the deft offload to a runner on an incisive attacking line as being a skill that can unlock defences and lead to well crafted and executed tries. We, well I, certainly love that, it's the awesome part of the game.
The attacking team were in possession, the ball although fumbled didn't touch an opponent or the ground before being passed/popped/tipped backwards so no KO.
In every game there may be many occurrences when you could blow the whistle but do you? Always?
To me it is straightforward and clear and without having to introduce additional factors to justify the decision, like Nigel did, I can make a judgment based upon what I saw, step through the process consider there was no offence and allow play to continue.
Going back to the basics of the game and the Charter, the aspects of enjoyment and entertainment come clearly into focus:
The laws provide the framework for a game that is both enjoyable to play and entertaining to watch. If, on occasions, these objectives appear to be incompatible, enjoyment and entertainment are enhanced by enabling the players to give full rein to their skills. To achieve the correct balance, the laws are constantly under review.
If that doesn't do it for you then not sure what to recommend as again you appear to want to dissect everything into minutiae rather than developing an understanding and feel that will show empathy with the players and enable a good game.