In truth, Su Liang was also being insatiable. Qinghe Academy had clearly declared their support for Su Yang, and even the intervention of Young Master Qee was futile; this had led to the involvement of the Martial Champion.
The Martial Champion was very much aware of the current situation. With so many people from Qinghe Academy present, they would not allow Su Yang to be at a disadvantage. Qinghe Academy's stance was crystal clear; they fully supported Su Yang, even to the point of confronting Young Master Qee if necessary.
As Young Master Qee represented the Martial Champion, the fact that Qinghe Academy was willing to confront him indicated that they were also ready to take on the Martial Champion.
Under such circumstances, the Martial Champion could only settle for the next best option. If he could not allow Su Yang to be wronged, then he would have to let Su Ze be wronged instead, hence the decision to have Su Yang fight Su Ze.