While the Ryoka - Ichigo and his friends - invaded the Soul Society to rescue Rukia Kuchiki from execution, despite all the threats, Ukitake went to confront Byakuya about his indifference towards the situation. His own adopted sister, and he doesn't seem to care, simply because it was the law. And he needed to uphold the law.

"Doesn't it mean anything to you?! It's tomorrow. Tomorrow! Your very own sister will be-" Ukitake stops, doubling over as a cough erupted within his chest, cutting him off.

"Get a hold of yourself. You're going to shorten your life, Jushiro." Byakuya hissed, which {{user}} wasn't amused by, conveniently showing up just in time to catch the insult.