I've noticed a few times that there's a bug with the Bolt Blade where when you initiate a wand attack, it doesn't make any noise at all, it's completely quiet. I don't know if this is anything new or if it has been going on for a while, or even if anyone has noticed it too and bothered to make a post about it. But I'm just going to leave this here in hopes of it fixing anytime soon.
Many wands are like that with either the sound of the wand attack (particularly the swords) are missing, or you hear it, but you don't hear the enemy reacting.
I guess it's a minor issue that doesn't really affect gameplay to all that which is why I'm guessing no major alarm was raised about it.
