Tyler made a mistake.
He harbored preconceived judgments about "the real Emilia."
The reason for Tyler's astonishment at Emilia's display was that the Emilia he originally knew was not the real Emilia.
The Emilia of that time was in a pseudo-autistic state following the loss of her parents.
With the exception of slightly opening her heart to Oleg, she was almost emotionless towards others.
However, in recent days, Tyler has, unnoticed, healed Emilia's emotional wounds.
Previously, Emilia closed herself off to avoid further harm due to the loss of her parents, her mental support.
Now, with Banning as her new mental support, the real Emilia from the past has returned. She is a brave foxkin girl who dares to love and hate.
The current issue is that Emilia's true appearance is, surprisingly, unfamiliar to Tyler, hence his astonishment.
(Silly Nissen: Huhuhu... Who would have thought, Tyler, that when a girl takes the initiative, you would be so timid! Hahaha!)