Just killed a 5 inch spider in my garage. It had stiff stick legs. It was moving too fast and hiding in cracks. I sprayed him with insect killer. That slowed the creature enough to smash him with shoe.
Where there is one, there are thousands, taking notes and studying your blind spots. They just watched you smash one of their scouts. You are now a blood enemy. Best to burn your garage now while you still can. If your local zoning allows it, use one of your tactical nukes to be sure.