Following the Command, the Archers shot right away even though King Zar isn't the one who shouted the order. They didn't hesitate to execute the task nor did they plan on disagreeing, King Michael is the man who was ready to face death for the sake of protecting this Kingdom and the two domains it is supporting, his word isn't to be taken as a joke and King Zar for sure didn't prove troublesome, he even liked the idea.
Although such an attack can cause a lot of damage, the enemy Army isn't completely dumb nor frozen in fear to the point of being target practice.