Being scolded by Kita is what Osamu had expected when he decided to come clean about his injury, but not because of him trying to absolve his upperclassman of having to take care of him. He gets a little bit defensive, as he would if the accusation of irresponsibility.

"'Tsumu wouldn't fight me over this," he grunts, because of course his twin wouldn't actually kick him while he was down, metaphorically speaking. Literally might be another story. "He'll be pissed, sure, but he'll help me get home just like any brother would. You don't have to go out of your way for me and miss practice, Kita-san."