I woke up this morning realizing that when I was puzzling over the one vs. two cars that the hunters may have seen, that I wasn't taking into account the fact that the hunters were only three minutes behind Sheila. That's a very short amount of time for someone to get Sheila to stop her car, go to Sheila's car and get into the back seat, shoot her, move her body to the passenger seat, and drive off before the hunters passed by - in which case the hunters would see only one car.
To me, it seems more likely that the hunters would have seen two cars. The killer is in the back seat and either still talking to Sheila, or has just shot her and hasn't yet moved the body.
The whole scenario still doesn't make sense to me. If it was Borja or someone else shewould stop her car for and would allow into her car, why wouldn't that person tell her they'd like to talk to her for a few minutes and have her follow them to the rest stop when her car was found? It's a very risky plan to shoot someone on a road where someone might pass by at any time, and risky to leave one's car partially on the road where someone might recognize it or make note of the license number.
To me, it seems more likely that the hunters would have seen two cars. The killer is in the back seat and either still talking to Sheila, or has just shot her and hasn't yet moved the body.
The whole scenario still doesn't make sense to me. If it was Borja or someone else shewould stop her car for and would allow into her car, why wouldn't that person tell her they'd like to talk to her for a few minutes and have her follow them to the rest stop when her car was found? It's a very risky plan to shoot someone on a road where someone might pass by at any time, and risky to leave one's car partially on the road where someone might recognize it or make note of the license number.