It's telling that you write what you believe is plausible.
There was an actual test to determine what Nara could have heard. It determined that she probably did not hear the scream....
Paul Ciolino Investigates Witness Nara Capezzali
http://www.youtube.com/watch?v=Nd-Th8lIxyo
I suppose you'll say he's on the payroll of the PR team. But try to make it all the way through the 3 1/2 minutes....
The actual test was (rather than your imagining): Looking directly on top of the house..... minute 2:18 is the test to see if they could hear people running from the cottage. Next, Nara herself contradicts what the police claim she said... she could not tell, "one or two or three" screams.
She did not know the time of the "sounds", presumably of footsteps. "But she was clear about one thing.
'She says she was never interviewed by the police.'"
The police only saw the witness (Nara) on television. "Not one cop has ever knocked on this woman's door, not one time."
"We're being told this is one of the pillars against Amanda Knox?" "Pretty weak pillar."
Once again, manufactured evidence.
My bet is that for the Florence trial, like Quintavalle before her, Nara will suddenly remember all sorts of things.