I'd call that a good 3 wheels off, luckily you still had 1 wheel on the curbing to help pull you back in. The wall gets close fast doesn't it?
I'm not a big fan of the lead/follow and that is one of the reasons why. It is pretty easy to shadow another person's car, following their line and speed, but while doing that you aren't really consciously picking up any references as far as brake markers, turn-in points etc. Having an instructor sit besides you is generally more productive, and each student is free to learn at their own pace.
I'm glad you had a good time though, looks like it was a good experience overall.