Certain tricks were only made to be used once. Especially against the mighty warrior Averoth. There's a limit on how many underhanded tricks could be used on Averoth and continue to work. Once he noticed Yielya's War Sight could swap things he was already on the lookout for more tricks.
His intuition reached a borderline sixth sense. A subconscious understanding of a battle's flow, and a mental process he uses to understand his opponent. The moment Umin was swapped with Tilia Averoth had already understood Yielya's intention to disrupt the tempo. A strategy he applauded, it showed Last Lights had some knowledge when it came to battles like this.
Unfortunately they could not capitalize on the opportunity she had created from the initial swap. Since she needed to create a moment of chaos, none of the others had a clue that the swap would happen.
