There's no hesitation in him when he grabs her hand too-tightly and shoves it away. She's wrong. She's not really Rita, she can't be. He's beyond being argued with, though, and he can't stop himself even if he tried.

His mind goes blank, and a shadow appears behind him. It's not anything like the Soul Eater, but Rita can't really get a good look before it lashes out and severs her head from her neck.