HSKS8 Game 2, Part 2

So, the second part of the game was to solve the quote below using the answers from the first part. The idea is that the first number cooresponds to the numbered answer and (I assumed) the second number was the letter in that answer, i.e. 14-1 is H. Well, when you do that, the quote you get is "Phen gn doubt, go to the lgbrary." Which SHOULD read, "When in doubt, go to the library." One easy fix would be the 18-1, it should be 18-2. The 20-1 though, I don't know what that is. The only other explanation I can come up with is maybe something was wrong with Ron Weasley when he said it? I can't quite recall what was going on that prompted that quote. Maybe it's SUPPOSED to read like that then?! Anyone remember?

20-1, 14-1, 9-6, 3-3
P-H-E-N

18-1, 3-3
G-N

19-4, 11-2, 9-3, 8-5, 15-9
D-O-U-B-T

7-1, 11-2
G-O

15-9, 11-2
T-O

15-9, 14-1, 9-6
T-H-E

13-8, 18-1, 8-5, 16-3, 6-5, 16-3, 5-3!
L-G-B-R-A-R-Y