My subject has become much less teacher-centered since my student days in the late 60s and early 70s. At times these responses are part of their oral grade. The rest of the class is supposed to be listening and learning from their responses. I'm on my feet a lot, using proximity to prevent problems, waiting for quiet, etc. Much room for improvement.
Students talk during the presentations.
I have tried giving the audience a task to do in order to focus their listening, which helps some. I'm not consistent with assigning consequences for this kind of talking. I realize that I need to teach listening procedures instead of simply trying to put out fires all of the time. I don't want to insult the students with a procedures lesson that seems too babyish, though. This is really a pet peeve of mine, but it's also valid from a management angle.