Of all the maxims that got tossed about during my medical training, the one I despised the most was "See one, do one, teach one." Everything about it annoyed me.
Why couldn't she have given him a checklist of things he would need to do and have prior to the procedure, so he would KNOW? Would that have been so difficult or so terrible? No. He would have been prepared for the procedure and been perhaps more efficient and confident about it. Why couldn't she offer a little guidance while she herself was doing the procedure, and prior to his attempt? Would it have killed her to do a little teaching? Well, no, but as is so often the case during residency, she probably had a HUNDRED other things to do at the same time - just as he did - around the time he was setting up for the procedure, and she probably expected of him what had been expected of her: magical instant competence.
But those things take energy, and time, and a respect for one's student, all frequently lacking in the hallowed halls of "teaching" institutions. You're supposed to show up knowing, and doing things well, and if you flub, the response is often anger. Anger at imperfections. What kind of teacher gets mad because the student has stuff to learn?