Actually, even before the duel began, Yino had already sensed something strange.
Normally, whether the Liu mansion or He mansion, any top-tier family would specifically build a cultivation and sparring area in the back courtyard of their main hall.
But...
When Lin Ze proposed going to the back courtyard to duel tonight, the Liu mansion elder coughed somewhat awkwardly twice, then waved to indicate that the two juniors Lin Ze and Yino should fight in the front courtyard instead.
Though this was barely a line of eye contact detail, it contained quite a bit of information in Yino's view.
From Yino's experience, the Liu mansion elder not allowing the back courtyard's open space for dueling was mostly because there were certain noble and secretive important figures in the back courtyard...
After all, at the Grand Tutor mansion level, the pinnacle of human hierarchy, even if an empress and national advisor were sitting in the back courtyard, Yino wouldn't find it strange.