Depends. The way I see it, a screenplay's focus is on the drama -- WHAT HAPPENS? WHAT DO THE CHARACTERS SAY? -- while a director's focus is how that is realized -- HOW DOES IT LOOK? HOW DO THE ACTORS SAY THE LINES and HOW DOES IT HAPPEN?
So, the decision as to whether to include the information should depend on whether the information is important dramatically -- whether it influences the flow of the story -- or whether it's just a dressing. Your job is to write the meat; the director's job is to do the dressing. So, the important question to ask is: is the silence required in the film part of the meat of the story, or just the dressing?
Now, obviously, that shouldn't be taken literally. Screenwriters write the mood of the scene all the time. If you followed the rule of thumb to the letter, it would forbid you from writing "A dark, dank alleyway" or "A creepy old house" for fear of stealing the directors job. You would be forced to only write about everything in an objective manner. Obviously, that would be terrible

! Still, it's a good rule of thumb, because for a beginner (me included!) it is vital to know how to write dramatically. Not just how to spice up descriptions and dialogues and such, but actually write EVENTS that are INTRINSICALLY dramatic. Relying too much on gimmicks would give you a false sense of security, because they would make scenes that aren't intrinsically dramatic more dramatic than they seem.
So, to sum up my rant, I have no clue. I'm just a beginner too

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