Barnabas is such a grandstander! If he had had any sense, he would have stayed out of Cassandra's way, and simply asked Julia to knock on Cassandra's door around 10:20 pm and say she couldn't sleep and did Cassandra have a sedative Julia could use? Barnabas should know by now that Angelique to be handled with great care, but instead he immediately tells her exactly what's going on so that she can figure out a way to fight back.
What does a 200-year-old person look like? Does anybody know? Sam Evans has surely never seen one. But he's an artist, so I suppose he can make a more educated guess than I can.