First, I am talking about manual cars and I know this is considered impossible because of the synchronized gears, but lets suppose that you can manage to shift gears (For example you could shift into reverse when stopped and then pull the car forward with another car, or even better, roll down a hill, always with the clutch)
So, you are moving forward at a reasonable speed, for example 100 km/h, and then you release the clutch with the reverse gear engaged, what would happen then?
My theory is that the engine would be forced to rotate the other way around, wouldn't it? Then, because of that, the engine would stop, and therefore it will "generate" a lot of force to the transmission and cause the car to reduce speed (all of this, if nothing breaks, of course)
Is this assumption correct?
There's a Myth Buster's chapter that tries this but with no luck on shifting the gear. Please try to avoid answers telling that it is impossible to shift into reverse when moving forward, as I stated before, I am supposing it can be done.