It'd have been cooler if the person on the foreground was holding a gun or some weapon. When it comes to a professional assassination I'm bias to an empty syringe...I won't say why....hehehe.
hehe if you wanted to do a spy/extracter look some thread would have worked well too or a wet cloth (cloroform was the old school drug but in a photo we can't tell).
But i must admit i first noticed the back seam.
The syringe came later!