Lex looked at Cassandra questioning his entire relationship with the woman. In his impression, she was always a direct and straightforward person who always focused on the task at hand. But clearly she had taken to cracking jokes recently, which is why she had not mastered the art of timing.
He waited for her to laugh, but instead Cassandra just kept looking at him with a straight face. His intuitive understanding of others' thoughts and emotions kept telling him that she was sincere, which made the joke even less funny.
For several seconds they just looked at one another which, considering the fact that they were immortals and processed time much faster than mortals, may as well have been hours.
"No seriously, what's wrong with her?" Lex asked.