I'm a final-semester nursing student, who witnessed an experienced RN shut down a resident who was doing an in-room cardiac catheterization WITHOUT sterile gown or hat, no mask, and just regular gloves

....the doc mouthed off to her about "I couldn't find a mask around here anywhere?"....I stood outside the patient's room and heard the RN shouting, "We do things sterile around here. We need to stop what we're doing, and start over!"....the doc did not stop, so she went to the ICU department, got the nurse manager, they both returned, and shut the doctor's procedure down...ordered PCTs and student nurses to retrieve all the necessary sterile items, and the attending cardiologist was paged. The attending arrived, looking disgusted, and supported the RNs action. The resident looked sheepish and embarassed. This was great for me to watch, from a student's perspective.