"It's been so long since someone was able to see through my final illusion. Impressive!"
Unlike Ayla's other illusions, which were much more focused on affecting you on a physical level, the last one was focused on your subconscious mind.
All beings have some things that they can just do subconsciously and don't even need to think about.
Ayla used that fact to her advantage. Being a great illusion master, she used the surroundings and created the background of an arena to make the participants think that they had no choice but to fight.
This is a subconscious response.
A rank SS is encouraging you to showcase your skills, and because you have a large arena and an opponent, you may subconsciously believe that you must fight and win.
But all of this is a planned illusion created to influence the participants.
"Once again, it's a pleasure to meet you two. I am the real Ayla; the previous one was an illusion too…"
