You have a good ear. At first, Secret Service Agent Jerry Parr -- who was with Ronald Reagan in the limousine fleeing from the Washington Hilton after the gunfire -- did not know the president had been shot. In fact, he thought he had gotten Reagan out of harm's way and got on the radio and said: "Rawhide is ok, Rawhide is ok." Rawhide is Reagan's Secret Service code name. Anyway, they were driving back to the White House when Reagan's condition began to deteriorate. And Parr decided to divert to the hospital. Even then, Parr thought Reagan may have punctured a lung with a rib during the scramble into the limousine. Nobody – including Reagan – realized he had been hit until a doctor spotted the bullet hole in his left side, about five inches below his armpit.
This scene is one of the most dramatic in the book. In a matter of about 90 seconds – probably less – Jerry Parr saves Reagan’s life twice. He got the president out of Hinckley’s direct line of fire (if the agent had been a split second slower, Reagan would have been hit in the head). In the car ride back to the White House, Parr noticed that Reagan had bright frothy blood on his lips – that’s a signal that the blood is oxygenated and coming from the lungs. So he decided to divert to George Washington University Hospital. Doctors say if Parr hadn’t made that decision, Reagan would have died.