Well, we've come to what I can only hope is the nadir of activity/interest/relevance in Apartment 3-G: Tommie knocking on a door alone and no one answering. Hoo boy. No where to go but up, I guess. I mean, if there weren't those thought bubbles there, this would be nothing.
But maybe that's the point. Maybe it's meant as a zen koan: if Tommie knocks on a door and no one answers, does it make a sound?