If you somehow equating that braking during normal driving is the same as brake-checking, then sorry, not wasting my time.
Yeah, you are wasting your time because you're arguing a monumentally idiotic point from a position of pure ignorance. First and foremost, you cannot possibly determine that was in fact a brake check and not braking during normal driving. Second, and here is the kicker, in that case equating the two is perfectly valid because the result was the same. If, and I repeat IF, that was in fact a brake check, the tailgater went spinning off the road because he was not in control of his own vehicle. And if it was "braking during normal driving" the tailgater went spinning off the road because he was not in control of his own vehicle. The common factor is that the tailgater went spinning off the road because he was not in control of his own vehicle. Period.
The tailgater went spinning off the road because he was not in control of his own vehicle.
The tailgater went spinning off the road because he was not in control of his own vehicle.
The tailgater went spinning off the road because he was not in control of his own vehicle.
The tailgater went spinning off the road because he was not in control of his own vehicle.
The tailgater went spinning off the road because he was not in control of his own vehicle.
The tailgater went spinning off the road because he was not in control of his own vehicle.
If the tailgater had been in control of his own vehicle the driver in front could not have forced him off the road by braking. Period.