User blog comment:B214/Season 3 discussion/@comment-3965848-20150707121633

I didn't quite get this at first but in the anime, Mjolnir also seems to have some sort of sealing ability as it did when Loki was being trapped in that Norse magic circle in episode 5.

And while we don't see Mjolnir shoot lightning, we do see the hammer give off some electricity when sealing Loki.