Well Matthew, you'll see from the text-books that the secondary effect of yaw is roll, followed by the nose nodding down and, if left unattended, a spiral dive.
But, if I may say so, you are asking the wrong question. The real query should be "Why does this instructor have no time to explain this to me?" Arch one eyebrow, see how things go ..... and if it happens again, find a proper one who has a schedule that allows a de-brief! Er, he did brief you beforehand ... didn't he?