Exactly! Of course, the blood would coagulate within minutes (unless victims were hemophilics), and any notion that human blood soaked a mattress and bedding and then penetrated floors, wallboard, insulation, etc. and presented on the masonry foundation is ludicrous.
An adult will have approximately
1.2-1.5 gallons (or 10 units) of blood in their body.
Seriously, spill a few gallons of any liquid on your floor, and good luck finding it oozing from your walls and staining your foundation!
www.forensicsciencesimplified.org
Principles of Bloodstain Pattern Analysis
To understand how analysts interpret bloodstains, one must first understand the
basic properties of blood.
Blood contains both liquid (plasma and serum) and solids (red blood cells, white blood cells, platelets and proteins). Blood is in a liquid state when inside the body, and when it exits the body, it does so as a liquid.
But as anyone who has had a cut or a scrape knows, it doesn’t remain a liquid for long. Except for people with hemophilia, blood will begin to clot within a few minutes, forming a dark, shiny gel-like substance that grows more solid as time progresses.
The presence of blood clots in bloodstains can indicate that the attack was prolonged, or that the victim was bleeding for some time after the injury occurred.
Blood can leave the body in many different ways, depending on the type of injury inflicted. It can flow, drip, spray, spurt, gush or just ooze from wounds