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If the Tesla braked at the last second, its bumper would have slid under the Focus's bumper and the Tesla would have had much worse damage while the Ford would have suffered little.
I had an accident like that once. Someone two cars ahead of me stopped for no reason on the freeway and I was braking so hard the nose of my car slid under the bumper of the car in front of me. By the time I made contact, I was only going about 5-10 mph. The grill on my car was destroyed and the hood got a bad crease, but the car in front had no damage at all.
A Tesla is already a fairly low car, if it nosed over at the last second as the driver finally hit the brakes, he could have easily slid under the Focus's bumper.
I understand the crash scenario you described, but looking closely at this photo, it doesn't look like the Tesla went under the Focus. It looks like it hit the back bumper directly. The Model-s should have standard height bumpers and hopefully an anti-dive suspension.
Its still amazing to me that a little Focus would come out so much better than the Tesla, which must weigh twice as much.