User blog comment:IamJakuhoRaikoben/Chapter 355: Song of the Fairies, Review./@comment-6299840-20131011225313/@comment-7418318-20131013084027

If you'd mention Gray being run through by Lyon's sword I could understand the choosing of the example, but quoting Naruto in a discussion about death' in Fairy Tail?

Anyway, that ninja in Naruto was using needles. They even point out in the story that those are only lethal if you specifically hit a vital spot since they only penetrate a few cm into the body. And Haku had plenty of training to hone his skill in needle shooting to make sure he didn't hit such vital spots.

On top of that Haku was also far faster than his opponents (or even his opponents perception in the beginning) which for helps with aiming for certain spots.

And he was completely collected and calm!

Erza on the other hand was shooting big weapons. Weapons heavy enough to penetrate deeply into a body or even puncture completely through, leave wounds big enough to bleed the victim to death even if it wasn't a vital spot that was hit.

And she had no carefully honed skills at that point, since she just discovered her power.

And she was far from collected and calm.

So it's very doubtful that at this point Erza had either the ability or the desire to carefully aim at non-lethal spots, even if she had weapons available that are suited for non-lethal attacks.

Combine that with the nature of the weapons she launched and I wouldn't want to make any bets on the enemy's survival rate....