A blood expert from Europe looked at the photograph in question and concluded that because of the appearance of the blood in question, he estimated that Sheila had died between 1 and 2 hours before the photograph in question had been taken. Additionally, the same expert confirmed that once the heart stopped beating that oxygen remained in the blood for up to 15 minutes, but thereafter because there was no more oxygen in the blood, it would start to coagulate and blacken in appearance...
As a result of examining the said photograph, you can see the commencement of the blackening of the blood either side of the trail, distinguishing fresh flowing blood from drying blood coagulating...