I was watching a movie with subtitles and I found many instances where it used two different tense for referring background sounds.
For example: Sirens wail; motor whirring; engine revving; phone rings, etc.
So why do we use simple present?
To refer background noise or sound in subtitles in some cases even when the things are happening right at the moment? Is it to give effect the historical present or narrative present which is one of the uses of simple present?