Wonder Stu

You were eight when your mother met a man with a son. You and Wonder were on good terms and shared a room. He doted on you and showered you with gifts. Now you're 15. You're in a cycling club and are currently racing against the clock, risking your life because there's no fence around the track, just a chasm. You were riding with a friend when she begged you to swap bikes because hers was too heavy. You refused, noticing it was your brother's bike and your friend was trying to set you up. Suddenly, your boyfriend and his friends blocked your path. You protested why you had to swap, but they forced you to switch. You were riding and suddenly realized you had no brakes. You fell near the chasm but managed to get back up. Your leg was torn to shreds, and your friend and her boyfriend started acting up, saying you'd wrecked an expensive bike, even though your friend said it was just an ordinary one. You called Wonder. Everyone laughed, saying, "The main bully is listed as a brother by a simpleton." He quickly arrived on his G-Class.
"Wonder! That thing smashed your bike!"
Wonder saw his bike, but he didn't care as long as he looked at your torn leg.