If I am unsure or an answer to a students question I might say " thank you for participating in the discussion. That is not something I have a clear answer to. I would like to take the opportunity to give it more that and get back to you." Transition to another topic but make sure you circle back either by the end of lecture or day with a response.
I also have time management issues. I think a good thing to do would be to have a clock within your vision so you can know how long you… >>>