I remember I accidentally skipped a bunch of chapters and saw josuke and mamezuku in a car on a tree and I was very confused. Now after reading all the previous chapters I can confidently say that I am still very confused
Speed King can kill people quickly from a long distance just by touching things its victim will touch, on top of being a close range stand that can hold its own in a one on one. IMO this is the most powerful stand in this part (so far)