My quoting doesn't work but I agree that the far away shot at night shows some cool sprays but I still think it is too far away:)
I would definitely agree that anyone, ESPECIALLY if they are an instructor, should never come that close to hitting ANYONE. What it looks like in the video is that the rider tried to set the heelside edge, which would have put them above the skiers, but chattered out so it sent them on the wrong line. Just skip that carve, do a quick heel to toe turn and then lay out another carve to stay FAR away from them. Even if you hooked up on the carve you would still have a lot of speed and the potential to really injure someone.
On a side note, why is that even in the video?