Sometimes, one of my colleague comes around to play the game on my system. Yesterday, he finished the mission Shoot the messenger. He chose not to kill Noore. A cutscene followed where Noore cuts herself, and drops down to the wild animals. She died and we finished the mission.
Afterwards, we went around roaming the city. A bit later, I noticed that another of "Golden Path" mission is available around the map. Heading on there, lo and behold; it was the same mission. I thought that maybe we didn't save the game or maybe there was some bug. We went back to the arena; the whole chase, fights, sabotage etc. later; we again chose not to kill Noore.
And yet again, there was still the same mission available to us. This third time, I had had to kill Noore.
My question is: Was it really a bug? As far as I can understand from reading the walkthrough, it doesn't mention the player to actually choose to kill her.