Board Thread:Speculation House/@comment-25185936-20140718223622/@comment-72.224.108.156-20140729044816

The way the opening narration in the first episode talks about dust being used against Grimm, and how we've seen, for example, Ruby surviving a big dust explosion with minor injuries, it seems as though the Grimm, at least the smaller ones, are much more vulnerable to dust and aura than humans, either because of humans using aura defensively or because dust/aura is especially strong against the grimm. The other answer is that the people don't get killed because it would be a much darker series if that did happen every time Yang punches some dude, but that's a bit of a copout.