Looks like Karl is on a quest to find the perfect partner to practice Japanese with!  It's difficult to find a Japanese person who is open to speaking slowly and clearly so that foreigners can practice.  Miki means well but I have a feeling she's putting too much in too soon for Karl and he just got a bit scared.  Ok, maybe A LOT scared!  I don't know about you, but when I have to respond in Japanese, I always want to be able to do it without a long pause to think.  I'm sure people understand that I need a minute to gather my response but it makes me feel slow.