It continued for...what might have been hours or days she wasn't sure, all Ruby could feel was the pain and all she could hear were those words, those words that said Sam would fail, or that she would fail him, that she was a devious slut that would hurt everyone he cared about, that she would destroy his family, Castiel, for a chance at the power he could give her.
It was during this time, a brief reprise, when Alastair was speaking of his plans here, saying something about demons, her kind of demons in LA. Ruby didn't understand what he meant, how he was doing it, and he said, twisting a knife in a wound at her abdomen that he would show her.
And he did, through the haze of pain and tired anger Ruby saw it, a black smoke cloud, like she was at her core, underneath the body she had taken, it floated not far from her and it seemed he had sped up the process, the torture and breaking all that was needed, implying time was meaningless here.
More torture, more taunts and eventually after more time had passed in a haze the cloud floated away and Ruby looked up to him.
"Why?, What does it gain you, Sam can send them back quicker than you could possibly make them"
It was her last bit of defiance. Ruby was a coward, she knew she was. It was all she could do not to betray Sam. She would break soon, she knew it, and likely so did Alastair