Yikes, I guess he had a serious hate or fear of spiders. My goodness. Thank the lord, the humans made it out okay. The things scare the heck out of me. Spiders, snakes and any other creepy crawlies can stay outside! I do not fancy them myself either.
But, NOT enough to burn down my house. (Or, at least I hope not.)
We do the same in our house. Spray Home Defense outside along the foundation and inside along the baseboards. Usually, we find them curled up and dead on the floor. (corners)