Makes me wonder if that was a blunt prop knife, since it clearly doesn't have blood after the deed, still solid enough to stab itself in a yu but not enough to stab people without real strenght.
^ The weirdest part. Even if yukkuri are weak, they could still injure peoples that way using knife (well, the knife injure people, yukkuri just provide the thrust)
Yeah, I'm also guessing its a prop/plastic knife, otherwise the human woulda been injured too. Not that that would have turned out any better for the yukkuri, what with the resulting media shitstorm that would have come about, and the following mass exterminations of yukkuri.
So, funnily enough, this probably was the best possible outcome for ALL involved parties. XP
It being a prop or toy knife would make sense, I recall a few pics of yu's using as mugging weapon those silly small knifes from that game on which you stab a barrel with knives to make a pirate pop out of it.
I wouldn't be surprised if yukkuris wouldn't be able to tell apart a real weapon from a prop or toy.
That's true, if anything the difference is how the real one harms non yukkuris while the fake one doesn't, but I supposed you need to be a very smart yu to consider this difference...