Viper, here's the "pale heart" that you've suggested I'm the only one to note. And, I'll throw in a pale liver as well, both from "blood loss".
http://www.news24.com/SouthAfrica/Oscar_Pistorius/Reevas-final-breaths-20140310
It also supplies us with the "missing blood" - if there was bleeding from the liver this would be huge.
And so, to recap :
Evidence for blood loss : A pale heart and pale liver.
Evidence that there was some cardiac activity after Reeva's final breaths ;
1) Prof Saaymans testimony that she would not have necessarily died immediately after the last breaths.
2) The blood splatter expert identifying arterial spurts on the landing.
3) Basic human physiology. In spite of your assertion that a heart beating for minutes after breathing stops is "impossible" I think crasshopper explained succinctly that the body's reservoir of oxygen allows this to happen. So much so that the layman CPR guidelines have been amended to only use chest compressions in a community cardiac arrest. It's also the reason that people with asthma, near drownings, drug overdoses, some head injuries (etc etc) survive a period of respiratory arrest. Furthermore, when resuscitating a birth asphyxiated infant the entire algorithm is based on the heart rate, NOT the breathing which is frequently absent.
You're saying :
1) I don't believe that the heart beat for some minutes after she stopped breathing because not breathing = dying.
2) The characteristic, reproducible blood splatter identified by the blood splatter expert on the landing is not arterial blood and caused by some odd flinging around of the body. I can't remember exactly what your reasoning was, you lost me when you likened it to a "compression stocking".
3) The blood splatter expert got it wrong because he didn't read the autopsy repost, even though he attended the autopsy. And I don't like his findings so I'm going to say he's wrong.
Finally, you seem fixated on there being no blood loss because she died of head trauma and resistant to any suggestion that the head shot killed her, incapacitated her and stopped her breathing but that the significant blood loss certainly didn't help.