Whoa there SouthXross - I was simply asking you to qualify the question so I could help give you an answer. The MEP Class Rating training syllabus is designed to include a night go-around and landing. Due to the fact that official night is still so late, it can sometimes be a struggle to fit that in. If the instructor was trying to get away with doing it during the day, then I doubt he would have exposed himself over the RT. The only answer I can think of is that you were wearing night vision goggles and didn't realise that it had got dark.