Beautifully constructive ending that in my opinion was rehearsed, or pre composed/constructed?

Final 32 seconds

There is an obvious motif/signature played by one sax, with the other sax responding like a “call and response concept” It repeates itself 5 times before both saxs simultaneously end with a long harmonic note.

Is it pre rehearsed? iF NOT then both performers are truly listening/ and or gawking at each other intensely through-out. They must of just gave the obvious nod..that luckily worked out, because how else are they going to end so ? years of playing together?

Maybe it is not pre rehearsed but pre constructed: they agreed on “hey lets end when i play that reoccuring motif say 5 times and we end together on this harmonic note, so until then dont worry on ending, lets just play”

There had to be a pre-discussion on this ending.”

well, normally i would disagree on this one, and i’d say that the piece was completely improvised with no pre-discussion whatsoever…

..but then i was talking to a friend who spent few years studying with Rafael Garrett, and something came up about Braxton wanting to record an album in duo with Garrett… Garrett agreed on the condition that the music would not be pre-discussed whatsoever, and Braxton refused to do it

..might be insignificant, but this just says to me that Owen might be right.. more than an ending agreed before playing, this sounds to me like it was signaled in some way, either by playing or looking or some other gesture