I wouldn't be surprised if it was a joking thing to a staff member.
I remember when Ayu mentioned being teased by Yo-chan "You'll forget the lyrics today for sure!" and stuff like that. And sure enough, that day she forgot the lyrics to Trauma and in her usual way laughed it off, but pointed at him accusingly. Much like she does now when she catches him laughing at her forgetting something or making a mistake.
For all we know, a staff member joked with him about that part of the revolving stage. All the dancers and staff have been saying that the stage as it is now can make you dizzy and lose your balance.
We can't see Shu-ya's face so I guess that's the reason we can't really judge this properly. But then again, I don't think it's THAT big of a deal. You get tired, **** happens, you feel even worse and you do things you regret.
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