Nina knew how determined Anna was when it comes to doing what she does best, and so did the former. With Anna holding her breath, she could only hold up the inevitable, and would have to succumb sooner or later.
The bootless assassin took her time and waited. It would be better to anticipate the odor of her boots assasulting the hair-grabbed sister, which sounds delightful in the ears of Nina.
"..."
Anna still refused to breathe in. But she was already struggling, that is what Nina counted for. Eventually...