The paramedics were inside working on his friend.
"A West Side man was ordered held on $50,000 bond Sunday on charges alleging he stole an ambulance that had two paramedics inside working on his friend in the Garfield Park community. Judge James Brown ordered Jimmy McCoy held on $50,000 bond during a hearing in Cook County Criminal Court. McCoy, 27, who was charged with felony possession of a stolen motor vehicle, is scheduled to appear for a preliminary hearing Oct. 15 in West Felony Court."
Source: Sun Times