Thread:StarlightAT/@comment-34431156-20160705041029/@comment-5290299-20160705041448

Those words were sadly ones he needed to hear. Izayoi feels ashamed right now. As explained in a spoiler, Izayoi felt the feeling of having lost, but also felt ashamed that he was the only person who would walk out of ths battle with a 100% chance of living, while countless others would die.

As explained here

https://gensakuchuu.wordpress.com/2015/04/02/mondaiji-tachi-ga-isekai-kara-kuru-sou-desuyo-12/

Izayoi is destined to be a hero. And heroes always win the important battles. So Izayoi was destined to win against Azi. The reason Izayoi was crying was because he was ashamed of himself, after all he was the only one who would survive with 100% of probability in that fight. He somehow “discovered” that during the battle, so if you remember the final words of Azi you can imagine how much this affected Izayoi. Izayoi wasn’t supposed to win in a fair fight, but he had Kuro Usagi’s lance and even Highness’ authority (protection) which made all even more “easier” to him.

This wjith the combined feeling of not being amatch for Azi in any category caused him to pretty much break a little inside. But this is necessary for his character development as Izayoi never experienced loss before. So the words azi says, I feel they are necessary.