"Katsu put his hands into the pouches in either side of his hips, where there were kunai with explosive tags attached. He swung them in the general direction, four of them hitting trees and the other two flying towards Kenta."

Could've saved a lot of frustration had you merely said "They would not explode upon making contact.", should probably do it next time. Kenta's point is that he doubted anyone knew of your plan and you put people at risk because no one knew what you were doing. Anyway, let's move on now.