Stalking

The joke goes like this: a not-Robin with a new name and a new face grabs a gun and knocks on Joker's door.

But this time, he doesn't call on Batman to prove himself to him. This time, there's no one around to stop him. This time...

...he pulls the trigger.

Tim's a stalker. He's not proud of it, but- no, okay, he's proud of it. It was how he became Robin, how he pulled Batman out of his depression, of course he's proud of it! Stalking his crush? Yeah, he's a tad less proud of that...