Shihan was explaining a kokyunage with footwork and position, demonstrating the blending and lead, showing how the elements come together to complete the technique.
Then he stopped and said, "Or you could think about it another way. Imagine you are following the tail of the dragon, chasing the smoke from his nostrils into the purple haze. Either way, pick a partner and give it a try."
I'm not speaking for the whole class, but my efforts at position and timing, feeling the energy of uke as they enter and leading that into a blend was a more effective visualization for me.
My kokyunages should begin improving sometime in the next decade or so.