This is easily my favorite cutscene from Days and one of my favorites from all games. I can’t help but think that the real friendship Saix refers to is the friendship between Axel and himself. He wants Axel to understand what is real and what is not, the friendship he believes he has with the other two is not the truth, because it was developed while he was Axel, a being without a heart, therefore with no emotions. The only true friendship resides when he was still Lea, a real person, so Saix calls his name to make sure he acknowledges that. These two (both individually and as a otp) have grown on me as I play the games, especially Saix.
At a point in time they had been bound by Isa’s lies that had taken the shape of a string of fate, and that string had been enough to make them both fall into an abyss of darkness that Isa desperately wanted to get them out of. Why was it then that it seemed like the string of fate binding Axel to Roxas and Xion had survived the transition? They only needed to tug it to have the other follow. They didn’t need to voice their need for help, their distress seemed to find its way through the red string and tug at Axel in a way that made him understand that he was needed.