The back of Paul Stine's shirt shown here also shows a distinct separation, with the majority of blood on the right side, with very little on the left, whereas the front of the shirt shows equal amounts on both sides down to the first blue line. However, at the first blue line it stops abruptly on the left side, but continues on the right, despite there being almost equal amounts of blood above this. Greater blood transference from a right-sided head wound should produce increased staining to the right side of the shirt if the victim is perfectly upright, however if you take a look at the collar of the shirt, marked C on the diagram, the staining is extremely high on the left side as well. This high left sided staining, the majority of the blood being on the right rear side of the shirt as opposed to the left, considering the near equal distribution on the front, and the blood stopping abruptly on the front left side of the shirt can all be explained in one simple scenario, along with the two patches of blood marked A and B on the left and right arm of the shirt. Only one sitting position can explain all these blood patterns and point to a Washington and Maple murder. And later, blood marks on the handle of the door will hopefully be the final piece of the jigsaw. The following is a quick refresher from the above linked article just to lead into the final part of this one.
The Zodiac Killer hastily exited the left rear door, possibly injuring himself in the process (Donald Fouke described a man later spotted on Jackson Street as having a shuffling lope, like a semi-limp) and entered the front driver side door and in doing so deposited either normal or blooded fingerprints on the panel between the doors. Then bracing himself on the front driver side compartment area, stepped over the lifeless body of Paul Stine to gain some limited control over the runaway vehicle. He now had to support Paul Stine's body in an upright position, pressing it against the driver side door with his left side, so as to access the taxicab pedals with his left foot and coast the taxicab away from the Washington and Maple Street intersection to the corner of Washington and Cherry, where it was found positioned in the above photograph.
The blood continues downwards staining the shirt as it goes, but stops almost linearly on the left side, two thirds of the way down, exactly where the arm rest of the door is positioned. With Paul Stine's body pressed firmly against this door rest the blood is prevented from reaching the lower portion of the shirt on the left side, where it gets channeled away, but pools slightly in this area. You will notice in the above photograph the streaks of vertical blood on the arm rest highlighted.
When the Zodiac Killer brings the taxicab to rest at the Washington and Cherry Street intersection he shuffles over to the right side of the front seat and pulls Paul Stine's body away from the left door and arm rest into a lying position to secure his trophy. The blood streak across the arm rest now is subject to gravity and forms the patterned blood striations downwards, depicted in the photograph above. This is not blood spatter from the initial shooting, as the rest of the door remains relatively untouched. The Zodiac Killer is spotted by three teenagers from the house opposite in the mid to right of the front passenger seat in all likelihood removing the rear section of Paul Stine's shirt. He then likely pushes Paul Stine's lifeless body over to the floorboard section of the front passenger seat, where heavy blood pooling is noticed in the crime scene photographs. The final resting position of Paul Stine is partially hanging out of the car door, likely pulled into that position by the attending medical crew.
The time period between the two intersections allows for the blood pattern to form on the shirt, something that is simply not feasible if Paul Stine had been killed at Washington and Cherry and had slumped over immediately. More importantly no shots were ever attested to by the three teenagers across the street and the blooded prints on the external driver side door should simply not have been there if the order of events had unfolded as we were led to believe.