As you probably know I do not believe Paul Stine was shot at the intersection of Washington and Cherry, but don't want to run over all that nonsense again. But I think it's fair to say that Paul Stine after being shot most certainly did not slump over to his right almost immediately, as depicted in the 2007 movie and certainly never fell over onto the passenger side seat. The crime scene photograph below clearly shows a line of blood pooling at the back of the driver side seat. The back of the passenger side seat however shows none. He clearly bled heavily, so if he had immediately fell to his right and his head had rested on the passenger seat, the right to left slant of the seat would have pooled the blood here, between the seat and backrest. It means Paul Stine must have been upright for a measurable period of time.
There are also virtually equal amounts of staining to the front left and right side of Stine's shirt, until 2/3 rds of the way down on the left side. I did a bit of measuring and this coincides nicely with the position of the armrest on the driver side door, suggesting at some point he was pushed or pressed against the door of drivers side, preventing the blood flow down the shirt on this side, namely between the Washington/Maple and Washington/Cherry intersections.

When he was eventually pulled away from the door over the Zodiac's lap to secure the trophy, the blood that had pooled at the armrest juncture was released causing the blood striations on the underside of the armrest seen below. Hope this makes sense, couldn't be bothered to write everything.
