Beth and Carol could still be with Daryl. We've seen them do this before where we get one side of the story in one episode, and then the other side in the next, with it all coming together in the end.
I am supposing that Beth's buddy that escaped ran off with Daryl for reenforcements, and they will be returning next episode (that follows that thread). The person Daryl was with who wasn't shown was probably the buddy. I THINK!