Vincent, he's slowing down.

That's no big deal. He's slowing down, it's normal.

He's slowing down to almost a crawl now.

Looks like... he slowed down around here, stopped, backed up.

He slowed down, coming to a halt halfway along a passage, where he sat down on the plinth of a departed statue and pulled the Marauder’s Map out of the pouch around his neck. He could not see Ron’s of Hermione’s names anywhere on it, though the density of the crowd of dots now making its way to the Room of Requirement might, he thought, be concealing them.