I've experienced the "slow motion" effect in a car accident, too, as well as experiencing things that were impossible.
Long story not-so-short, a lady lost control of her car on the freeway, and spun around 180 degrees. She was still moving fast, but was going the wrong way. I'd just merged onto the freeway, coming around a curve to do so. It's hard to explain, but there was a divider that prevented me from seeing her until it was too late to avoid the collision (that interchange has been re-done since then). I'd just reached a regular freeway speed (55mph) from the merge, and that's when I saw her car coming toward me, in slow motion. Oddly, it was twisting and bending and warping, almost as if it was made of Jello. What in the world?!? Cars can't do that!
As I was puzzling over her Jello car, I realized she was slowly headed my direction. I looked around a way to avoid her, but there was nowhere I could go. I hit my brakes, braced myself, and we collided head-on. It felt like slamming into a concrete wall. Ow, to put it mildly. Her car was most definitely NOT made of Jello! (LOL!)
As my car was slowing down, I remember bright grass and brush flying past the windshield. I had zero sense of direction. Where was I? Had my car flipped? When the car came to a stop, I started checking to make sure I was still in one piece. Feet? Yep, they're there. Legs? They look okay. Etc.
Suddenly a man knocked on my window, startling me. I have NO IDEA where he came from. That's when I realized I was holding my breath, and started gasping for air. He asked if I was okay, and I said yes, and I asked him to call my husband. Then he was gone, as fast as he appeared!
I gathered up my belongings, including some computer disks and blueprints where I was doing some subcontract work for a local business. I remember feeling that I absolutely had to protect their disks and blueprints at all costs (they had multiple backups - it was all easily replaceable). I clung to them like my life depended on it. (I wonder if Jason initially did the same thing with his belongings, then later put them down?) The police showed up, and a few minutes later, my husband got there.
That's when I noticed that my car had stopped pretty-as-you-please in the emergency lane on the freeway, as if I'd purposely parked there. The car never got in the grass at all, even though I clearly remember grass and brush flying past the windshield. I also noticed that I'd missed a freeway sign pole by inches. I don't remember seeing that pole until then. I also don't remember the man calling my husband, but later my husband told me that the man had used his vehicle to straddle the lanes behind us, to keep additional vehicles from being involved. Another bit of weirdness: The impact took out my steering and brakes. I have no idea how the car "parked itself" so tidily in the emergency lane, safely out of traffic. Somebody was looking out for me that day!
Injury-wise, I had some nasty bruises on my tummy from the seatbelt (lap belt only; it was a 1970's vehicle that we were restoring). The steering wheel broke, and I bumped my head on the sun visor somehow, breaking it as well. I had some back pain and soreness afterwards, but nothing serious. No "open" injuries at all (no blood). The other driver was okay, too.
(Oops, I didn't mean to write a book! LOL!
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But anyway, yeah, time and perceptions seem to do some weird and confusing things when you're in a super-stressful situation. It's possible that my little head-bump could have temporarily affected my perceptions after the impact, even though I didn't have a bruise on my head or a knot or anything. I wonder if Jason's wreck caused a head injury, and if so, if that caused the same "protect-my-belongings-at-all-costs" reaction ... then something happened (perhaps the injury worsened?), causing him to put his belongings on the road for some reason that made sense to him.
But if he was injured and wandered away, where the heck IS he??