Astonishment
Kurosaki Ichigo was to say at least stunned, at the most he resembled someone who had come into contact with an electric eel.
The overzealous renegade hollow or arrancar—Ichigo couldn't tell which anymore—laid on the pavement of Kankura town before it dissolved into thin air. Apparently it felt that if it had dragged his lifeless body to its beloved "Aizen-sama" it would get high stats in Hueco Mundo.
The defeater of the renegade now stood before Ichigo in absolute victory.
The shinigami, Kurosaki Isshin smiled and said "By the way son, you forgot to say 'Happy Father's day.'"
An: This is dedicated to my father, Happy Father's Day Dad!