Ms. Irrelevant to the Rescue

Poor Cynthia,  she was always the last chosen. Her main “flaw” was always studying and reading anatomy textbooks. Cynthia joined a civilian expedition to explore the South Pole where she and her team would be isolated for the rest of winter to experience coping abilities in harsh conditions (in preparation for Mars). You know the rest: one of the intrepid researchers develops pain in their umbilicus and within hours the pain shifts to the lower right-hand quadrant, clearly following a classic presentation of appendicitis. But with no physician on the research team or even remotely in the vicinity, and with no ability to fly one in, the decision is made to instruct our amateur-anatomist-turned explorer to perform an appendectomy using AI-created instructions. All goes well, except that Cynthia overrules the AI instructor when they urge her to momentarily tie off the blood supply at the location indicated by the arrow.

Question: Where does Cynthia correctly, but momentarily tie off the blood supply to prevent blood loss after appendix’s blood supply was inadvertently cut and not immediately visible?