One thing puzzled me. How did he know where we were. The C152 had no navaids at all, apart from a DI and compass of course.
Not hard if you know the area, the easy way is to do half in one direction then turn round and do the rest the other way, add a bit for the into wind direction (20 kts of wind for 20 mins means 12 mins into wind and 8 downwind) and you will be near enough where you started, it will not be exact, but near enough if you know the area, even adding in a couple of steep turns.