Actions speak louder than words.
Zippo’s actions on the day of the attack are not those of someone that was surprised by the attack.
No concern whatsoever about what was taking place clearly indicates prior knowledge.
It would be no different than if you were notified your home was being attacked and your family was in danger, yet you calmly went about your business as if nothing was out of the ordinary.
It just doesn’t happen.
The police would consider you suspect #1 in your families murder.
You’re getting warm . . . .