If you are doing 60mph, that’s a mile a minute, or about one hundred feet per second.
That hundred-foot skid mark was probably a half-second or so, maybe less.
I found this skidmark vs. speed calculator.
On zero grade dry asphalt or concrete, the car would of lost about 50mph during a 100 foot skid. But it still smashed over a guard rail and fliped with enough force to disingrate a porsche with a extremely beefy body cage built into the design.
He must of been speeding, at least 80 to 100 mph.