They are being professional soldiers as they are every other day on the DMZ. I spent 3 days there several years ago. The tension is so thick there you could cut it with a knife. My understanding is that they go through similar psychological training a submariner would undergo. It takes a very special person to man that post.
N Korea is definitly a wierd country in their thinking due to years of being so isolated from the rest of the world. They have perpitrated a few attacks over the last several years, but their attacks were no more disturbing than a nat on an elephants butt. The little man has a big sword to shake at us although he does realize that if he goes to far we will promptly shove that sword up his little ass and I doubt there is a country in the world that will do more than shrug their shoulders and say,'he deserved that...little punk' and move on.