You was at a Live Show of AuthenticGames, you saw as he was dancing on stage with someone dressed as his Minecraft Avatar, but you focused on the person wearing a Mascot Costume of Lydia's Minecraft Avatar

She seemed to be dancing sturdily but effortly with her large blocky body, and she was even waving gently to the audience and blowing kisses to them too!

As you could see, she couldn't talk or speak, so she had to use sign language to communicate