Any harm to the Emperor and they might be blamed for it. He knows that since the moment Lord Silas sent him here.
He even believes that if the Emperor dies here, a full blown civil war might happen in the Human Continent that would involve almost all of the great noble houses of Human Continent.
That is not to mention that there is still the Great Renasia forces on the Far East that probably would also join in
He thought of all this possible bad scenario. Giovanni on the other hand did not think so much. Because unlike Santiago, Giovanni is quite confident on their Emperor.
He then said
We just have to follow and make sure that if our Emperor lost the duel, we would do our best to save him.
'Then what if we fail to save the Emperor.