You get far enough ahead that you are just able to clamber up onto the roof before the man appears below.  You find an unlocked hatch (seriously, do those janitors lock ANYTHING?) and make your way into the library.  You figure the stacks are a good place to hide.  As you come around a corner, you see the man’s grinning teeth, impossibly perfect for a train hobo.

“Hello, child.  Do you have anything to say to me?”

You can either apologize and hope for the best (15), or you can run (16).