A trick of the light. 

Karzohk had no memories of his past life, but he still had the same calculative mind. There was a chance that this turaga was his mission, disguised through illusion or shape shifting. No one else would draw such a conclusion, and it was absolute madness to assume that some odd reflection was proof of an imposter. Karzohk was not like most people. Still, he couldn't risk blowing the mission on a hunch. He decides to follow her conversation, inventing some code that only a disciple of Mnemosyne would discover.

"I found a Doom viper in a nest of Dikapi."