Questions like these are asked to make sure you have common sense, overtly, but covertly are really just trying to see how you think 'on the fly' when asked something unusual. Yes, this type of emergency could happen, but it is extremely rare and the question is just to feel you out. As a training exercise, you should be ready to verbalize conventional wisdom here, i.e., that common sense dictates that coverage for the patient have continuity either by terminating the procedure with stability or, ideally, finishing the procedure with stability.