>>512378417caltrops were originally designed to hinder pursuit on foot, however I can see how sharpened tubes would also work for on foot and car
my issue with these is that they're over-engineered for their purpose, look at the way they're designed, way too much work went into this, a could nails welded together and bent could get the same effect, angle grind the heads into sharp points
whoever this was they were a try hard, a moron, and a faggot, therefore a larper, probably misuses japanese words alot and watches way too much anime