Reg was correct when he pointed out how silly it is to fret over something that didn't even make it into the movie.
I just can't help myself, though: I have to play the fool and address the idea of the nonlethal battleaxe.
While there is often a generous amount of disbelief to suspend when it comes to the lethality of superheroes and their arsenals--people walking away from being hit with Cap's shield seems pretty unlikely--in this case we are talking about a halberd. Sure, Robin could carry it around every night and use it for things other than disembowelling criminals, if it was written that way. However, it would be a lot like if DC decided that Superman now carries an AK47 with him in case he needs to shoot kryptonite out of the hands of his enemies. Yeah, you could write it that way... But it would be ****ing stupid. There are a million ways he could do that without carrying a weapon designed for the sole purpose of killing guys. Why on earth would he pick that weapon for that purpose?
Those are the options, in my mind. Either he killed people with it or instead it's just plain stupid.
Anyways, if we're really honest with ourselves, do we actually believe that, if there was a Zack Snyder directed flashback where Robin wielded this weapon, that nobody would die?
Fine, it's dumb to get butt hurt by concept art. But one has to understand the the battleaxe is just a single point in a continuum of reasons that I'm not okay with the level of lethality displayed by heroes in Snyder's films.