Should I stop?

This is a common question that is based on a common occurrence. Things grinding to a halt during an audition can be the result of a variety of factors. Your pianist takes off an a tempo that is extremely difficult for you to navigate. You blank out in the middle of an aria you've done 500 times before. Something throws you off (a person barges in the room by mistake for example). You get the idea. My take on this is that there is nothing wrong with stopping, and either resetting either to the beginning of the piece, or to a logical starting point if you're already mid-stream. In my listening experience, this almost always yields superior results to forging ahead and hoping for the best. It also gives you an opportunity to show poise and control in difficult circumstances, which, after all, is a subtext of your audition.