Trivia: The Jackal demands $500,000 (US) to assassinate De Gaulle, which seems like a modest amount for such a dangerous job. However, when you take inflation into account that was the equivalent in 2019 money of over $4m. No wonder his putative employers are surprised.
Trivia: Fred Zinnemann wanted the Jackal to be played by an anonymous actor, so he passed over established stars such as Michael Caine, Roger Moore, and Jack Nicholson in favor of Edward Fox. He later admitted that his decision might have been what contributed to the film's sub-par performance at the box office.
Answer: He would have just slipped away into the crowd, probably with some minor alteration to his appearance. He was a master of disguise and no one knew his real identity or what he looked like.
raywest