When Dr. Morton rushes in to scrub up to share emergency surgery with Dr. Rossi, he soaps up once and scrubs quickly. He is not masked. In actual surgery, he must be already masked upon entering, and must soap/scrub, rinse and repeat more than a few times for a period of about fifteen minutes. Due that this time length of course could not be shown, it could be implied with a clock or dialogue. When Dr. Morton enters and begins surgery, he is still not masked, and never puts his mask on: this would not be proper procedure.