Lupin Gets Uncomfortable

Lupin becomes uncomfortable and then often changes the subject:

Quote	Source
"It's getting worse," Harry muttered, biting off the Frog's head. "I could hear her louder that time - and him - Voldemort -" Lupin looked paler than usual. "Harry, if you don't want to continue, I will more than understand -"	Book 3, page 239 Prisoner of Azkaban, Chapter 12, "The Patronus"
"I heard my dad," Harry mumbled. "That's the first time I've ever heard him - he tried to take on Voldemort himself, to give my mum time to run for it. ..." ... "You heard James?" said Lupin in a strange voice. "Yeah..." Face dry, Harry looked up. "Why - you didn't know my dad, did you?" "I - I did, as a matter of fact," said Lupin. "We were friends at Hogwarts. Listen, Harry - perhaps we should leave it here for tonight. This charm is ridiculously advanced. ... I shouldn't have suggested putting you through this..." "No!" said Harry. ... "Ready?" said Lupin, who looked as though he were doing this against his better judgment.	Book 3, page 240-241 Prisoner of Azkaban, Chapter 12, "The Patronus"
"I have not been helping Sirius get into the castle and I certaintly don't want Harry dead. ..." An odd shiver passed over his face. "But I won't deny that I am a werewolf."	Book 3, Page 345 Prisoner of Azkaban, Chapter 17, "Cat, Rat and Dog"