Kote Uchi - The attack
The second movement is intended to show how Uke can attack Nage with Kote Uchi. Nage therefore does not react.
Uke takes two steps, 1-2, lowers the bokken slightly and cuts Nage's wrist from above.
Uke is then the first to go back starting with the back foot. Only after that, Nage begins to retreat.
(For demonstration, the roles of Nage and Uke change in the video.)