.......to put a stop to this ridiculous discussion............if someone were to phone the services at 3.15 saying they just heard a woman scream and they were asked what time was it exactly that they heard it and they replied it was 3.16 .....woudn't that kinda put a spanner in the works regarding your theory.......or if someone simply replied a few minutes ago.......all that could be deducted from that was that it happened before 3.15.... as for a timeline..........it's all in the abstract.......what we do "know" though is that people heard a womans screams.
If someone phoned at 3:15 to report hearing screams and then, bizarrely, was asked for an exact time of the screams heard, any time given wouldn't be reliable- only approximate. (As I have said in many posts to you).
If the reply was 'a few minutes ago' then yes- what could be deduced would be that the screams were before the time of the call. But then repeat this process with the different callers and a better timeline of who heard what and when would emerge.