Ayane had two options in front of her. She could either leave Natsuki alone like she wanted, or she could call her out on her bluff. However, she had just spent a few hours lamenting the lack of information she had on the Shadows of the Universe, so she couldn't help but take the opportunity. 

"You shouted out a name. Shizuru, I believe it was." Ayane said to her. "...do you mind if I come in for a bit?"