When the Margraves army started to retreat, the Helvati took the act as - fleeing.
So in their joy and fury, the 10,000 men broke all semblance of formation and scattered into uncountable smaller groups of fives and tens, wishing to chase after their prey no matter the cost.
These men were like a raging bull, only seeing red and in their blind fury, they started not even properly to look where they were going.
They entered such a frenzy that even the numerous calls from Alexander to restore the frontline and stop this reckless chase went completely unheeded.
It was standard practice in most parts of the known world by now not to chase a fleeing enemy lest you get caught out of formation and be counterattacked.
And this was especially concerning now since Alexander could sense that the Margraves formation had not really been broken.