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Perhaps an even easier to understand example.
You record two person dialog EFP style. So you set up your camera and shoot a 2 shot over the shoulder (OTS) with HIM face on to the camera talking and HER nodding and responding to his lines.
Then you move the camera to record the second half of the dialog (her stuff).
After lighting her and getting ready, you roll the camera to concentrate on getting HER lines recorded correctly. Only to FAIL to notice that between those setups, the AIR CONDITIONING came on.
When you go to cut the scene together - this happens.
CUT TO HER: "I still love you." (WITH air conditioning sounds)
CUT TO HIM: "No you don't." (WITHOUT air conditioning sounds)
CUT TO HER: "Of course I do - forever" (WITH air conditioning sounds)
CUT TO HIM: "Then why did you shoot me?" (WITHOUT air conditioning sounds.)
Recording room tone (both with and without the AC if you're smart - allows you the choice of ADDING the AC sounds to HIS clips to even out the sound field.
Or, if you have enough takes to cut the whole scene without AC but suddenly notice in post that when the AC is off and the set is quiet, you can suddenly hear the grandfather clock ticking away in the backgroun d - then you have some room ambience to use to either add or subtract or just MOVE the ticking clock sounds so that there's consistency in tick tock timing against your newly cut audio track.
Audio is fun, huh?
Hope that helps.
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