"So what exactly was going on?" Little Bruce asked Schiller. They were in the study at Wayne Manor, except a thin mist clung to the walls, sealing the room off into an independent space.
Little Bruce had seen everything that had just happened. Unlike Dick, he was better at deduction and could quickly sort out timelines that were far too complicated for ordinary people.
From the perspective of the youngest Nightwing, namely Dick, he fell asleep, jolted awake, went out, and instantly arrived at that office, where he saw them asleep.
It was a complete timeline. The only spatial transition in the middle was that he arrived at the office the instant he went out, but that was not difficult to accomplish. At most, it was teleportation.
The sleeping versions of them seen outside this office door were still part of Dick's past timeline, because they really had been asleep earlier.
Then another office appeared before Dick, and through its windows he saw a series of events that would happen in the future: the remaining two being attacked by the eye, panicking and driving the car onto the rooftop, then falling off.
This was the first time the timeline changed. Dick was not in the car, which meant he had still left according to the original sequence. That timeline could therefore have been this Dick's subsequent future.
After seeing that future, Dick acted. He returned to the office displaying the past and threw out the fire extinguisher, which meant he had changed the past and would accordingly create an altered future.
That altered future was the story brought about by the Main Universe Nightwing appearing later. Dick threw down a fire extinguisher, which struck the Dick of the past, preventing him from leaving successfully, causing the Main Universe Nightwing, who