the tooltip of Blade Shield (introduced only recently with 2.4 or so) indicates a radius of 4 meters although in reality the damage radius is much less. It will only hit monsters right next to you. The radius has been like this since the launch of LoD, I believe, but with the tooltip, I don’t think this skill is working as intended.
Now, shortly before 2.6 goes live, please fix this bug. It should be fairly simple to fix, would improve Blade Shield’s utility significantly and offer opportunities for new builds (e.g. it interacts nicely with venom).