That's how you live your whole life, knowing that you are the best of the best, that there is no one who can boast a better bloodline than yours, that no one alive can reach your level. Well, you train little by little so that you don't forget science. And then some ragamuffin comes, reaches your level in a couple of days and destroys all your beliefs. Yes, if I were Byakui, I would have lost my nerves a long time ago.
Summary: Byakuya pretends several times with "this time you're finished" fails several times, but still continues to believe that Ichigo is "stupidly lucky", because if he recognizes his strength, then Byakuya and his pride will be overtaken by an existential crisis.
at the end, I saw the "shift" of Byakui's emotions, bankai Ichigo is impressive =)
thank you! I laughed very much at night from your comment