The Eastern Roman Empire was a place of grandeur and majesty, and Byzantium (known today as Constantinople) outlived the Western half of the empire by centuries. However, while the Eastern Empire was known for its wealth, for its culture, and for the prominent role it played in the spread of Christianity throughout the world, it was also known for its political treacheries. Usurpers were not common, but they were far from unheard of in the city's history.
These days, everyone knows what a safe word is. It's a word, or a short phrase, you can say as a signal to let other people know you are no longer comfortable with an activity, and you need it to stop. The word originally comes from the kink community where participants would be engaged in scenes that might push boundaries, and trigger unwanted emotional responses. Bondage, whipping, consensual non-consent, etc. In some cases a person might even want the freedom to shout stop without their partner actually stopping.
Be honest, you've got a zombie survival plan.