User blog comment:IamJakuhoRaikoben/Chapter 386: Galaxia Blade, Review./@comment-24546844-20140531010425/@comment-7418318-20140531171221

I think it might be able to, if the caster wanted it. For example if the "old" Angel had been able to use it, I'm pretty sure it would have been lethal.

But just like all the other Fairy Tail Mages, Lucy does not have any killing intent... or if she has it, it's locked so deep within her that it never surfaced and probably never will.