Folded hood in hand, gun in right hip holster, knife in left hip holster, ties in back pocket. Equipped for serious business. Drives around, looking for weak members of the pack. It's getting dark, so stragglers would be the best. People sitting out watching the sun going down, far from anyone else. Drives around...finds a car parked on an isolated stretch of road. Parks behind them. Gets out. Walks down. Obviously whoever owns the car is going to walk down perpendicular to the car's location. Goes down, mills about looking for the owners of the car. Locates them. Begins moving in their direction. Waits till he's a certain distance before concealing himself in the hood he's carrying. Hood on, he pulls the gun to seize control. You know the rest. Then he leaves. Figures two dead people out on a rock after dark won't catch much attention any time soon. Same MO as previously seen. Pulls his magical pen and does a lettering job on the car. Drives off and around back to Napa down Berryessa Knoxville Road, into the 128, into the 121, into Napa. Or he could have gone west...
Probably right-handed since his gun was his weapon of choice, and he liked to park right of his victims cars.
As for the guy the three girls saw...maybe. One says he was about 40, which puts him right in the age range of 35 to 45 per Fouke and the kids. Mageau, on the other hand, said he was...younger. And the girl in question said he drove a "conservative" car, meaning something an older individual would drive. Certainly goes right with what Fouke said about the old, pleated pants he says he saw The Zodiac suspect wearing...
But then there's the issue of the clip-on sunglasses...
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One wonders if this individual was him. Some have said he would not have allowed himself to be seen, but he DID let himself be seen by Shephard, which is how she was able to describe him. Certainly, this individual's behavior indicates guilt and/or suspicion, and it seems he didn't want to be seen too closely. Possibly he was looking for a victim or victims, but had to reconnoiter without the hood, obviously, which meant taking the risk of being seen sans disguise. Other behavior at other crime scenes indicates a pre-attack anxiety.
I'd say...it might have been him. Then again, one of the other girl's described him as 28, well-built. His car was, she said, a '67 or 68. She said he passed within 20 feet of her. He then disappeared about 4:30, some two hours before the Hartnell-Shephard attack. None of the three girls describe this man as wearing glasses. They also describe him as having a round face, which contrasts with the Stine composite.
On first glance, yes, could have been him, but probably not.
EDIT: Regarding the sunglasses....Hartnell claimed they were attached to the hood, directly, so that obfuscates the matter regarding the man seen by the girls considering he was not wearing glasses.
One wonders how he determined hair color and greasiness....
My apologies for the error. I should have known better.