The stick movements that your friend did is pretty much exactly what it takes to do a FLAT SPIN... A rearward CG helps. Controls surface size and throw helps. You can enter it from straight and level or as your friend did. Let it stall, drop the nose, give full up elev, full left rudder and some left aileron.... Asit starts to spin and level out, move your ailerons to the center and on to oposite just enough to hold the wings level to the horizon.... Throttle will help control the SPEED that it spins.... More throttle=faster spin and vice a versa. If the CG is right and you have enough elevator AND the plane isn't too heavy for it's size, you can actually do a CLIMBING FLAT SPIN which is where you GAIN altitude.