Master Yoon is such an interesting character, when we met him, he killed a person just to make his point but basically all we saw after was him being not as brutal as we though he would be, this surely is rapey, but gentle, far from the nightmare Na-Kyum had...I'm really intrigued.
I do not think that this happened. Uke is just not experienced with a magic weapon and because Kain was focused on his thoughts stopped observing the exercise for a sec and then the last target attacked
Imagine getting fucker by 10 thinking about 6.(yeah i know its rape, dont come at me)