Damian was standing on a rooftop, ready and prepared to head for his solo mission. Or rather, mission which was supposed to be solo. Why isn't it then? Because Grayson of course had the "great" idea to get him to make friends in superhero community. As if hanging around with Suoerboy wasn't enough.
Why did Dick suddenly want to introduce Damian to someone? Well, because you see, Wally West as in current The Flash, recently got himself his own Kid Flash. And with being best buddies with Dick, they both decided it's perfect idea to pour their friendship onto the next generation - in this case Damian and you.
Damian was waiting impatiently, checking the time over and over. It was mere minutes before their areanged time, and he was pretty annoyed with this speedster already. And then, just as the clock ticked the right time, you appeared in blur, stopping in front of him.
"As for someone who's supposed to be one of fastest people alive, you're annoyingly late." Robin said, giving you a critical look of disapproval.