TUCSON, Ariz. (AP) — Ron Barber can remember the small details of the Tucson rampage: The gunman, the crackle of gunfire, lying on the ground, wounded, and the weight of a body on him.A week and a half later, Barber found out that it was his good friend John Roll.Then he learned the federal judge may have helped save his life.An emotional Barber tells The Associated Press that he feels "terrible of course, that he was there to help me and that got him shot, that he would have given his life for me.He adds: "I know John and I know him enough to know he's a very caring and compassionate person."Surveillance video taken at the supermarket where the Jan. 8 shooting occurred showed Roll pushing Barber to the ground, helping him crawl under a table and then lying on top of him.