Bujutsu Demonstration's.

[Brian R. VanCise]

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[terryl965]

Nice long video, Brian where they throwing nails or soikes in the middle of the clip

 

[Bigshadow]

Nice long video, Brian where they throwing nails or soikes in the middle of the clip

They are bo shuriken, although, I think there are other names for them as well. They are essentially throwing spikes. I guess a well placed one would be lethal, but I think their intended purpose were distraction and harrasment of the attacker to buy time.