The werewolf notices sudden fear.

The policeman notices sudden 'suspicious behaviour', which translates to 'guilt' usually.

"Absolutely," Angua says pleasantly. "The weather's more clement, the people are slightly less likely to try and kill you, and I can get a decent pint."

She pauses, and runs a hand through her blonde hair.

"Are you going to ask it, or do I have to guess what it is and try to answer?"