And if he doesn't eat at the pub? Somebody else sits there?
You're introducing uncertainties which make my point for me that it is far from a easy means of killing someone.
Sure a gun makes noise. That's it. That's the only disadvantage. It's louder. But I'm sure the Russians can afford a clean gun and dispose of it later. It's also more certain. As things stand the target(s) are still alive.
A gun killing also opens the doors to lots of theories as to who could have done it whilst the agent points back to a narrower path.
And not a hope in hell, if he had died right away that the Brits would just write it off as a natural event.
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