Sam's brow knitted together when Kanuna mentioned losing his nerve. Why would he be concerned about that? It didn't make any sense. He was also hovering on the threshold of the apartment he shared with Clara but as far as Sam knew his friend wasn't a vampire so what could possibly be stopping him from making himself at home as he had done in the past?
He was definitely taken aback when the other man confessed to knowing what Sam was and that he too was a werewolf and had been since he'd turned 16 years of age. His confusion was clear and apparent in his face given its expressive nature.