The fall of Zhang Xu Kingdom would definitely spread, bringing pressure to the other big kingdoms. They didn't want to lose, not in the slightest bit.
Thus, the war will definitely be fiercer.
They didn't want to see Fei Yang Kingdom grew stronger, so what they could do was to push their own soldiers at the border to create more trouble for Fei Yang Kingdom. Whether it was effective or not, they simply didn't want to allow Fei Yang Kingdom to be strong enough to conquer them too.
They had been in the warring state for so many years, how could they be willing to accept being conquered?
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Lu Family was part of Zhang Xu Kingdom that was considered loyal by Emperor Zhang Hou Tian. Not to mention, the head of their family was Heavenly General Lu, who was staying at the north border, facing the fierce attacks from Fan Yi Kingdom.