I have had people post that these bites might not have been spiders. I am convinced that in these 2 cases they were due to the pattern and progression of the injury. I have had other bites i the past, including a cottonmouth, wasps, bees, ticks, and others.
Even if it was not a spider, the point is that the zapper stopped the pain, stopped the swelling, and stopped the infection that was obvious.