He just sent his elites forward. He did the same mistake than fuuki in the ouki war.so you're telling me no one was able of pointing out to Makou that there was a detachment coming for his head, even though Ousen clearly had a clear view of the battlefield?
where the hell were Akou's guards anyways? in Shin's first battle against Zhao (the one where Ouki died) the commander that he was charged of killing (i think his name was Fuuki) was completely surrounded by bodyguards!
this is another case of author favouritism leaning towards Lebumku as always