In all honesty, St. Peter probably wasn't too thrilled about dying a gruesome death. Rather than think about that, he wanted to change the subject. St. John was standing there when he turned around. Maybe St. John was looking joyful; maybe he was making notes for the Gospel we are reading right now. Who knows? St. John says again that he could write more than he has written, and as we think about it, that makes sense. There is nothing about the "signs" of Jesus that seems normal or ordinary. Even as we know that these are ordinary people caught up in the story of Jesus, Jesus and his story are anything but ordinary. Jesus answers him by saying basically, "Don't you worry about him! You have your own job to do! If I want him to be alive when I come back, what is that to you?" We can see why people might have thought that Jesus meant that St. John wouldn't die. On the one hand, St. John is the only one of the faithful apostles who did not die for his fait...
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