A body is found at 6:00 a.m. on a Cairo roadside. A forensic pathologist establishes the victim was shot once through the heart from behind, while seated. The victim arrived at the airport at midnight. Time of death is estimated at 3:00–5:00 a.m. The victim has defensive bruising on both hands and one elbow. A detective notes that the gap between airport arrival and death proves the murder was not a simple ambush killing at the airport. What specific forensic and circumstantial fact most directly supports this conclusion — and what does it reveal about the nature of the operation?