This is the first episode of a new series entitled Nightwing. (not to be confused with other series with similar titles based on the same character, Dick Grayson. Robin, turned Nightwing, turned Batman.) How did the dynamic duo split. Why did Robin ever leave Batman to form the Teen Titans. Some say it is because Batman treated Robin like a sidekick instead of a partner. Others say its because Batman still treated Robin as a kid although he grew older. Others say its because Robin wanted to step out of the Bats' shadow. Still others say its because he wanted to see if he could become a leader and lead his team to victory, which he eventually did against Trigon and Slade/DeathStroke among others. After a spending three years as leader of the Titans, he decided to leave.