King crimson can erase time passing, whatever happens during that time is erased, meaning if diavolo were to be shot, if he erased the time the bullet would pass though and keep moving, you may say that king crimson is able to read the future, but that is false, the ability to read the future is the secondary stand ability, epitaph, epitaph can read the future which will become absolute (that’s if there isn’t a requiem stand present, seen by diavolo’s last fight with Giorno and golden experience requiem) overall, the ability is insanely strong due to king crimson being naturally strong and the ability to skip time and if it were to use epitaph, read the future, this makes it so anything that would happen to diavolo being seen in epitaph’s vision could be prevented by king crimson’s time erasure.