

I’m pretty sure I remember the scene too, actually! That’s probably why I’m so adamant that the original poster is confused or bending the truth for dramatic purposes.
I think most people from the U.S. would understand the context like I did… because Watson reacts to the gun being in the desk.
If I’m remembering it correctly, Watson pauses or something when he sees a gun in the drawer. At the time I wasn’t exactly sure what kind of show it was going to be, or what the context of the gun might be. But him pausing gave me information! It’s a TV show made when they provided information visually instead of also saying it out loud.
Even if someone wasn’t thinking about the laws or culture of the country the media was made, the context needed to understand is provided right in the episode.
But it’s more fun for OP to spin that up into “People from the U.S. are so used to guns…”





His hand being right above a firing, shortened shotgun is an interesting choice.