with a spot I damn him.
When Mark Antony (David Morissey) says this line, the loud sound of an explosion can be heard in the distance. The staging of the explosion as Antony marks the name of his sister's son is a dramatic effect use to emphasis the impending doom of the conspirators once their name is marked. The way how it appears Antony marking his name down, resulting in the explosion, makes appear as such a simple action like marking a name can result in much larger consequences later. This shows the true military power that Mark Antony possesses over Brutus in this civil war.