OP: My guess would be that they are with someone working in the business and they only have one car. The person either has nothing better to do and is willing to wait or for what ever reason it's not feasible for them to go home/someplace else.
Or they are waiting for the most opportune time to kill you and take your car.
Or they are waiting for the most opportune time to kill you and take your car.
Being told you're delusional does not necessarily mean you're mental.