[As he thought, she can still move somewhat, and he's oddly proud of that. It takes extraordinary strength of will to overcome astral binding.]
[Still, he doesn't intend to use it to defeat her. That wouldn't feel right. It was more curiosity, to see the effect, than anything. He takes only a moment to decide his next course of action, and then charges, full-force. His spell releases a second before he meets her, no doubt enough time for her to defend.]