She knew what he was doing, but it didn't make it any less effective for knowing it. This is what he did. She'd seen him do it more than once. He was going to break her, she knew it. But she wouldn't betray Sam. She just wouldn't.
"Yes with Azazel's blood" she managed and shut her eyes as he continued the taunting and the cutting. She wasn't clinging to Sam, she wasn't building him up, she didn't need to build him up, and he was special, he was, and he wasn't...
"He isn't WEAK" she shouted unable to stop herself, it was just what he wanted of course, breaking her by taunting her about her humanity, about Sam and her devotion to him, he knew just what buttons to push.
"He's gonna change everything and you...you and those like you, you're time will be over" she said, she even sounded devoted to him, even as Alastair continued the cuts she managed to laugh, a mangled laugh mixed with the pain of what he was doing to her but he hadn't broken her yet. Not nearly.