User blog comment:Deafro/Episode 14: The Episode I Hated/@comment-12100845-20131018233619/@comment-16763585-20131019053312

It is terribly inefficient to convert electromagnetic force into mechanical energy, especially at a distance where the shift decreases at a exponential rate. That is physics though, something that shouldn't be judiciously applied to storytelling, because the audience is coming for a good time. After all we are talking about people who can fly through the air on sniper sythes.

Even ignoring that though, the magnetism didn't affect the sword, it affected the shield. He had to swing his arm with more power than Ruby has in her Dust shells, the ones that took out the skill of a Beowolf.