Because Katya was the "victim" so she was AGAIN clarifying that nothing happened of concern (because her 3 or 4 other attempts haven't been believed)
He didn't "put her in this position". They were stood like so many couples are and he moved his hand on her stomach. She politely moved it back. He didn't go for a boob grab or ass smack or anything so bold (although the MN sharks are making it seem like that). He wasn't ensnaring her like a snake as someone else has made out either.
It could have been an attempt at a tickle, like someone standing behind you slowly running their fingers up your back until you laugh or squirm. It could have been a call back to a comment in training about hand position which would make it an inside joke. It could have been pervert's chicken - "how far can I stroke her stomach before she stops me". It could have been a show of ownership, "look Kai. She's mine". It could have been nothing but a moment of simple instinct.
We don't know. What we do know is Katya, the victim, has repeatedly said now that it was nothing to be concerned about, it wasn't dodgy and to focus on his dancing not him. She spoke to a welfare officer and said she was fine. Which means that, right now, we should respect that and believe her.
I'm sure their training sessions will be monitored more closely for the next few weeks, they'll be positioned at the back of the Clauditorium and they'll both be acting very carefully and mindful of their actions because the gutter press will be out in force, analysing their every move.
And if, in 5 years time, Katya turns around and says that, yes actually it was just part of a bigger picture of abuse and inappropriate actions from Wynne and that she had told the welfare officer she was uncomfortable but they just told her to play nice and make the apology, then we can deal with it then.
But right now, it's almost insulting to her to keep insisting she is obviously lying etc etc.