Maybe it was because Chip is really a Dallas Stars fan. :D
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Why were you trying to get him to sign your book a second time? If a character sees their signature in a book already they're supposed to try and avoid signing again unless the guest absolutly insists upon it. A lot of times there are older kids and adults who just want to see you sign again so they can compare signatures and confirm that it was two different people doing the signing based on differences in the autograph.