Many of Lord Kite's men had vehemently opposed their commander's initial orders to retreat from the battle for they felt that such a cowardly move made all of their sacrifices till now been for nothing.
So instead, they wished to continue the fight further still, aiming to achieve final victory in battle no matter what. Furthermore, many of them were even convinced that the brutal fighting had softened the legionaries enough that they were close to breaking, thus fueling the bellicose sentiment even further.
This last part did have some kernel of truth to it as a lot of Remus's units were indeed close to cracking.
But the caveat here was the same thing could be said for the Heeat soldiers too. They were just as susceptible to turning their ships around and running as the other side.