Ok, but even if the general dies, it doesnt make sense that the whole Zhou army disperses.
Fuuki was right that there was no point in killing the general especially if you already lost the whole Qin Left army.
When you're literally at 10% of your men and you're surrounded on 3 sides, killing a general doesnt do shit. You would have to combine the death of a general with a new attack to make the Zhou disperse