User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 45: September 2015/@comment-94.71.39.253-20151004062152/@comment-25324252-20151004070925

I create the Battle Arena fights, when I said duke it out, I meant a competition between friends as I imagine scenarios in which the two would likely face off. There is no situation in which Lucy would have a battle to the death with Wendy. Even so, for just one opponent, I doubt she would sacrifice one of her keys. I think her keys and the bonds she has with them mean more to her than her life. When I make a judgement on these characters, I consider not just their ability, but also their personality. Knowing Lucy's personality, she would not be willing to break a key to win against Lucy