No one is expecting him to be awake at four in the morning. No one, in fact, is expecting him to be awake before around seven in the morning, it appears. The dorms' silence is only broken by the soft snores, and the common room doesn't have even that.
He unfortunately seems to not be anywhere in sight. Mrs. Norris bristles and hisses, then bounds off.
Running away would be breaking the rules... but they've already broken the rules through no fault of their own. And Argus Filch is terrifying.
He thinks he can navigate the school well enough, although he's never done it at night...
"This way," he says, picking himself up off the floor.
He hurries, but quietly. Stairs, corridor, more stairs - Mrs. Norris went that way so they should go here -
Except they hear Filch's voice a bit ahead of them: "What is it, my sweet? Students out of bed? Show me them!"
Back the other way, then - maybe the Fat Lady will be back -
But the stairs have shifted. Now they lead down instead of up.
Well, better lost than captured. Muninn will find them. Onward.
They'll certainly manage to get away from Filch's voice! Except it becomes increasingly obvious how lost they are and by the third unfamiliar corridor Neville starts sniffling. "We're lost... what are we gonna do...?"
"We'll be fine," says Victor. "Muninn will find us and lead us back to the tower. We just have to keep out of Mr. Filch's way until then."
Nothing whatsoever.
And there's Mrs. Norris at one end of it. She hisses and starts running after them.
They go around a corner and run some more but then they can hear Filch's voice coming from the other end of the corridor—" Are they here, my sweet?"
Cat behind, Filch ahead... and a door locked with a padlock on a wall between.
This is probably a bad idea but it would also be a bad idea to get caught -
"Alohomora," he whispers, tapping the padlock with his wand.
They slip through the door and close it and Neville leans with his back against it, breathing heavily.