The woman smiled at Lina's anger, more amused than anything else.  "Yes, I expected you'd want to know why you're here.  We're members of the Black Lights Casino, a place for gambling on somewhat... less than legal fights, we'll say.  Don't worry about your friend at all, she's in a cell somewhere else in the building, but she's safe, for now," she said, giving Lina a cruel smile at the last bit.  "Anyway, the two of you have been taken here to be new competitors in the arena fights.  Of course, we want to ensure that you'll be entertaining for our guests, so to ensure you will fight and not simply surrender each fight, you'll be allowed to win freedom for both you and your friend if you manage to win enough fights."