In a developed 21st-century country, water is not a particularly rare resource. Zheng Zha could choose to destroy a fire truck, just as Wen Lie could choose to alter the battlefield.
Therefore, Zheng Zha did not plan to retreat, nor did he intend to attack the fire truck, letting it vanish from his sight.
Water was nothing; the extreme heat of Crimson Flame was enough to evaporate it.
Chapter 71