During the fight between Liang and Nitra, many events happened that revealed their true strength. This was logical since the stronger a person was, the less he wanted to use his maximum strength, especially if one believed that there was no reason for it.
If Fifth Chronicle Creature was attacked by Fourth Chronicle One, even if there were many of them, Fifth Chronicle One would never use his trump cards or the Form to do so. There was no need to, as a few attacks were enough to win.
Nitra realized that Liang was one of the strongest, but even so, it was impossible to use everything she had at once. It was simply illogical and stupid.
If she used all her trump cards at once, she would lose the initiative and too much energy. Liang would just be able to use her trump cards a little later and win the battle of attrition.
However, there was something wrong with this fight.
