Stealth doing parkour down a hotel wall

“Did you really come down the side of the building to catch me?”
“I did. It is a Parkour technique.”
He glanced over his shoulder at the tall hotel and the columns of balconies. “Wow.”

Excerpt From Ex-Purgatory, pg 222
Peter Clines
https://books.apple.com/us/book/ex-purgatory/id676938479