You quings bow has enough explosive power in its non charged shots to disable the trebuchets, battering ram carts and seige tower wheels. This would allow him to remove the threat of the entirety of the enemies seige weapons himself before they got within 500 meyers of the city. Next his lightning pearl attacks are capable of killing any non jewelled soldier with a single pearl. He can spam hundreds of them out per second he should not be having this big of a problem in this fight....
Ixdaer