I'm not new to teaching in general, only teaching the violin. When I'm working with my student I sometimes get distracted trying to hear what the student is doing and I, miss a beat, play the wrong note, et cetera.
I do what my teacher did: apologize and say that the only mistake that isn't acceptable is not to try. I've also taken up a statement (wish I could remember the source) "You cannot master music, only be prepared for the next lesson it will teach you."
Since there are some professional violin teachers here, what do you do when you make a mistake during a lesson?
Violinist.com is made possible by...