A man talks to two guards as he holds a drink.
The prisoner is talking to two guards in the prison cafeteria.
The man could have been a visitor instead of a prisoner and they could have been in another place than the cafeteria.
Not all men are prisoners, and holding a drink does not necessarily mean you are in a cafeteria.
Just because a man talks to two guards as he holds a drink does not mean he is a prisoner in a prison cafeteria.