In The Day of the Jackal, the Jackal uses some technique to kill people silently without any struggle:
- He kills complacent Colette de Montpellier just by kissing and gently holding her for several seconds: she passes out and never wakes up;
- He kills Jules Bernard (a gay man picked up at a Turkish bathhouse) just by approaching him in the kitchen and doing something to him behind the wall — again, just for several seconds, without any struggle or noise whatsoever;
- In the hotel lounge where he chats up Colette de Montpellier, an old lady is later found dead in her chair which draws the attention of all staff. He uses that moment to look up Colette's room number in the guest register.
I presume that all could be done with some sort of substance applied to the victims' skin. But the movie did not make it clear to me.
So, how does he do it?