Yes, I was just looking back on Sam Alford's testimony and while I think he may have over-estimated some of his times I can't ignore the fact that they must have lasted several minutes at least, after about 12:15, for him to recollect different periods of screams and intervals.
If Libby was screaming after the rape, he hadn't asphyxiated her during the rape.
If Libby was screaming because she thought he was going to rape her, that means she hadn't yet been raped by at least about 12:17 - and that means shortening the screams SA heard to just 2 minutes overall. I think the pauses and patterns suggest it was longer than 2 minutes. If he hadn't raped her by 12:17 I don't think there's any chance he managed to rape her and get her in the river and himself back to the car by fast walk, in less than two minutes.
If Libby was screaming during the rape the same applies - he had to have asphyxiated her when the screams stopped and my impression, from the pattern noticed, is she was still screaming beyond the time he would have left her (12:17-12:18) to get back to his car.
I don't think he could have asphyxiated her.
Reminder of SA's testimony
Mr Alford said: “Initially, some screams were intermittent with 30 seconds or a minute between them. At first I sort of ignored them then the second one was a pattern to them and then that’s what sort of made me think - it’s hard because where I live is near the uni accommodation is teenagers on the park, girls screaming, people out having parties on the park so you tend to ignore it. It happens all the time.
“Then I heard the screams again and when I looked I couldn’t see anyone on the park. The screams were enough to make me think, ‘what could that be?’ but it was the pattern - they weren’t constant and that’s what sort of stood out for me.
Pawel Relowicz is giving his account of what happened to Libby - updates