@Siikalahna Calm down son, that was what he was doing several chapters ago, and they developed countermeasures already.
And despite being OP, he is still one person, and in war, no man fights alone. What do you think will happen then, when he is busy trying to snipe the riders? There are several corps of dragons, around 21 in total, all advancing towards the HQ.
Tell me then, Sun Tzu, how you think the battle should be done