Hearing Cyrus' words, Blata's face wrinkled as he felt the threat of death looming over his head. Right from the very first day, Castiel changed and became so majestic and charismatic, Blata knew something was up. A member of the spineless royal family suddenly became bold and boldly challenged the church.
His first thoughts were to eliminate Castiel but then, there was something about him. Some sort of aura that kept warning him of the impending doom if he should engage Castiel in a fight and that's why he is yet to face him in battle.