Unless there' some kind of specific hand movements(like in, i think, nacchu koi, they have them using opposite arms) then they always hold it with their left so they cant do the dance moves with their right.
Anyway else feel like with this concert Yurina is back, like it seemed at one point she was slightly loosing some control over her voice (especially in nyoki) but it seems she's now finally, totally gotten over that!
I'm so happy because she has a beautiful voice!!