I did a production of Macbeth in the 1960s in which I had a swordfight in the final scene. But the blade fell off my sword just as I was stabbing the guy. I ended up having to hammer him to death.
Had Shakespeare listened to the news of Duncans death in a tavern or heard the knocking on his own bedroom door after he had finished the writing of Macbeth?
The life of the dead is placed in the memory of the living.
Marcus Tullius Cicero
When you're a young man, Macbeth is a character part. When you're older, it's a straight part.