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Since nobody else has been identified as screaming, it seems reasonable to conclude that it was the person who was shot four times that night.
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I believe Mrs Stipp said that the screaming got louder, as though it was someone coming closer along the street. (Or words to that effect.) But nobody was coming along the street, or the Stipps would have seen them.
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I will, though.
Professor Saayman corroborated this when he stated that screaming is an involuntary act, and that Reeva would almost certainly have screamed when shot even in the head.
BIB 1: Could well be you are right, but is it beyond reasonable doubt ?
BIB 2: IMBW but IIRC the sounds Mrs Stipp heard getting louder as though it was from outside in the street were screams and the words "help, help, help". On OP's version, he went out onto the balcony screaming "help, help, help" and rushed screaming back and forth from the bedroom to the bathroom... nearer and further. (I keep saying I'll make a quick visual comparison chart of what each person heard and when).
BIB 3: Not sure Saayman did corroborate it (I need to check) and wouldn't it would depend on whose report you read since wasn't that the day/s there was no live reporting so we only have limited re-hashed 2nd hand information about that testimony?
BIB 4: Again, could well be you are right, and I am not saying it isn't correct, but is it beyond Masipa's reasonable doubt?, i.e. a) OP said he couldn't have heard with the shots, b) even with a gap between first and second Burger said the shots were quick, i.e., bang, bang,bang,bang and IIRC her hubby and the Stipps said they were quick too, c) there are a few graphic videos around the web with people just shot and all kinds of other horrible things, and they don't all scream, moan, groan or howl, d) I have unfortunately seen many animals shot or run over and strangely not that many howls, groan or shriek as they go into shock. It depends on where they are injured and the speed as too many go into shock.
PD: Nice layout! I've started using the scissors recently... gotta do sumpin to turn this not reader friendly layout into something a bit more interesting !