 En route to the hospital, Hill flashed a "thumbs-down" signal and shook his head from side to side at the agents in the follow-up car, signaling the graveness of the president's condition.The limousine then rapidly exited Dealey Plaza and sped to Parkland Memorial Hospital, only minutes away, followed by other vehicles in the motorcade.Hill maintained his position shielding the couple with his body, and was looking down at the president.