"Who are they talking about?"
"The guy who kidnapped Claire."
"Who kidnapped Claire?"
"The guy who kidnapped Claire!"
More amusing than outright dopey. We don't know anything about Ethan yet, so that's really all we can say. ;)
Then the flashback kicks in. "I'm confused, who are these people, and where are they?"
"You may have noticed by now, over the past 12 or so episodes that the show flashes back to events pre-crash to inform us about the characters. And that's Charlie..."