Imagine how scary it would be to be a driving instructor. You know that feeling when you are in the passenger seat, totally at the mercy of a driver you aren't too sure about behind the wheel? It is like that, except every day you are putting your life in the hands of a driver with zero experience on the road. The only thing that makes this even remotely ok is that the instructor usually has controls on their side of the car as well. Regardless, it has to be an awful experience. Which is why this instructor is so awesome.
First, he predicts the coming issue because of course the Yukon with a Flying Spaghetti Monster emblem is going to change lanes in the middle of the intersection without checking their mirrors, but a new driver doesn't know that. Then, he expertly avoids the wreck he knew was coming all along. Then, he calmly lets it sort itself out and patiently explains how to avoid such situations by driving defensively.
The way he handled that was perfect. Clearly, the student was overwhelmed. She didn't need a lecture on how badly that could have gone, she just needed calm guidance on how to turn the scare of her young driving life into a teaching moment.
We wish we learned to drive in such an environment.