I don't think the spider thought that there might be a giantine foot come to occupy the slipper. Besides, depending on how small it is, it might still have found it a handy, safe spot. Spiders are very shy. They hide in dark corners and in small recesses for safety. This spider will probably not go to that slipper again, if it learned its (hard!) lesson.

Another thing about arachnids is that they have an exoskeleton that protects them. It's good armor even against the large foot of a human. The human's skin is rather flexible, and the spider skeleton very rigid. I don't think the spider would come to much harm unless you were chasing them to stomp on them.

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