ACTION LOG:  Tim & Cass hang out. (semi-closed log, ask if you'd like to jump in).
WHERE:  The city at night.  Possibly rooftops, because Batkids are unoriginal in their hang-out locations.
WHEN: Night-time (post dark hour).

Usually, Tim tries to sneak up on Cass.  It's a pride thing.  She's faster than he is, stronger, could outfight him in her sleep... in stealth, at least, he can still be competitive.

Mostly, he still loses.  Which is okay.  It's training, after all, and it's fun.  But sneaking up on a first-story apartment offers no real challenge in terms of approach... and given that he doesn't want to scare the daylights out of her young roommate, it just seems unsportsmanlike to play that game, here and now.

Still, knocking on the front door just feels wrong.  He looks around the empty hallway, shrugs, and does it anyway.