I think that's got to do with which mode of performance you're in. We all behave slightly differently, depending on what we're doing and who we're with, so in your case, it might just be that when you're in that particular mode - "telling something dangerous" - your stutter doesn't affect you as much. This doesn't mean you should always be in that mode, nor does it mean that you can take something from it and apply it everywhere. It just means that, in that kind of performance, the way you are all in all tends to lower your stutter. - And yeah, I probably don't have to mention that the stutter on science isn't done yet, so there's a lot going on that we can only surface guess at.