mine was for a microlight license
and yea, similar to the first description, instructor jumped out, told me to take off again....
muuuch shorter takeoff distance due to a a quarter of total take off weight being gone, but also didnt feel too much or think about it too much.
flew to a point 10 minutes away and then back, its only on the way back when i wanted to ask a question through the headset that i realized 'o crap, im all alone.... gave me the biggest smile ever'