You go to travel back only to find that only one person can time travel back to a spot in the time line.
"......When I said I would have to live up to being called a hero...I meant that in the one way every person hates about heroes...when their choices hurt you for the sake of others.."
Black Star flies into a rage and starts beating me. I fall to one knee from the blows. Black Star's robotic limps are now far more bulky and heavy so each strike from them hurts more.