After Sal gets punched that day in October, his mom lets him take a "mental health" day off from school (10.1). This means that Miranda walks home alone.
She's worried about the Laughing Man, but, as luck would have it, the person walking behind her is the kid in the green army coat – the one that punched Sal.
Miranda spins around and (using her rule for living in New York City) asks him what time it is.
The boy looks back at the sky over Broadway and says, "It's three-sixteen" (10.5). The boy explains that he can tell the time because the sun went behind one of the buildings yesterday around the same time. It's October, so the days are shorter.
He has a key too (another latchkey kid) and tells her he doesn't have a watch. Miranda is no longer afraid, but feels weird and guilty for talking to the kid who punched Sal.
Back at the apartment building, the Laughing Man is asleep with his legs sticking out from under the mailbox.