Wow, very interesting, shellymos!

DS8 repeats sometimes, but not really under his breath and he doesn't seem to limit it to the last few words. With him, it seems more like he was proud of whatever he said and wants to savor it - everything from a silly wisecrack to an insightful observation. I also agree with Chris that it might have something to do with the way the words feel in his mouth.

But now I'll have to listen more closely to see if he whispers the tail-ends, too.