Ace pressed his lips together. He had another idea as to what Senna was doing but he wasn't going to say it out loud. 
Z looked uneasy at the request, as if she didn't know how to explain it. "[i]It is hard to explain,[/i]" she signed, tilting her head back and forth as she thought. "[i]There is a seal between myself and Him that can be broken, and if it does then I can be taken over and stuff like this happens.[/i]" She paused for a second, seemingly at a loss for words.
"[i]I can not explain it well, I'm sorry[/i]," she continued, dropping her eyes back to the ground. "[i]He simply just wants to make people suffer and bend to his will. I have never had control. He tugs at your thoughts till you give, then he is very hard to fight back.[/i]"
"Be glad she wasn't started accidentally cursing people," ace muttered under his breath.