I've been noticing this (as a third party) a lot lately in one of my classes. It's a Gender and Communication class-- all about feminist ideas, sociology, philosophical theories, etc...so some of the concepts are kind of nebulous, and it seems like at least one time per class a student brings up a point, goes on about it at length, and the words just don't seem to make
any sense. (not just to me, I mean the professor isn't getting them either.)
I understand how that happens-- if I try to express an idea that's at all complicated in a classroom setting, it always seems to come out a
lot more muddled than it sounded in my head-- but I've been thinking about it lately from the professor's point of view... Imagine trying to figure out how to let someone know that they just flat aren't making sense to you, in front of a room full of spectators, without making them feel like complete idiots, and without letting the class get off topic! This teacher seems to have a whole set of responses to it, all carefully crafted to blame the misunderstanding on himself, get them to stop trying to explain it, and get the discussion back on track ...It's an art form!