Mina smirked faintly, almost unnoticeable for all the others, as the slave submitted in a less obvious way. He wasn't mindless, at least, that would be to her benefit. She acted to be thinking about his offer before glancing at the others with a questionable look in her eyes. 
'I suppose it's fine, right?' she asked.
As she held up her act, one of the ones that did nothing at all stepped forward towards the slave that had approached them and grabbed his chain, pulling him up. Rage took over the demoness as the soul acted as if he owned the half demon. 
She slammed her fist into his chest, maybe with a little too much force, to get him away from the shadowed demon. 'Stay away from him, he already submitted.' she said to him sharply. 
Not an entire truth, she was mad because she was the one he submitted to, not this measly little soul that did nothing at all to interest her, but it fit with her act.