A disengagement may be equivalent to a potential crash (or, just a mistake on behalf of the human doing the disengaging), but not to one actual crash. That some

A disengagement may be equivalent to a potential crash (or, just a mistake on behalf of the human doing the disengaging), but not to one actual crash. That someone intervenes to prevent a dodgy overtake does not mean that car was definitely (or even likely) going to crash had they not intervened, for instance.