This discussion may contain spoilers!
First, I'd like to say how cool seeing The Witching Well was. I liked how the room was deathly quiet, and when Bigby peered down into it, it looked as if the inner walls of the well were expanding slightly, like it was alive.
Second, who would like to visit The 13th Floor? What with the whole glamour black market thing, I'd imagine visiting the spellcasters up there for answers would be a logical thing to do. Also, if the Tweedles were looking for a book on how to make glamours, it may be why they went to The Woodsmans place...it might also be what Faith stole as a means to gain enough money to pay off Georgie's debt and provide for Lawrence...