Thanks for clearing that up for me. When I was a kid we had the bumbly non-spider ones in the garden, but now we've got the sinister spider ones in every corner of the basement and garage. I guess the leg thing is convergent evolution?
FWIW, they tend to not rebuild webs in places where they got destroyed repeatedly, so if you can do that without killing the spider, it will likely move to a more quiet location. Their webs - I learned at the time - are not sticky, unlike most other spider species' webs, and they do not tear down and rebuild them, rather they extend them over time and happily take over abandoned webs.
These spiders have decided to live life with PvP mode on, very cool.