If the owner of the slave was attacked and threatened with death, his slave was obliged to help his master, even when he has no weapon. He had to use all means to stop the attacker: fight with his bare hands, shout, separate master from the aggressor.
If the slave did not take any steps to protect the owner, he was subject of appropriate punishment according to the law.
Keith Bradley, Slavery and Society at Rome, 1994
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