Yuzuru helping Ibara while scolding him for getting hurt in the first place is a Yuzubara staple. Although Ibara has always had a high level of self-preservation, he is also incredibly proud and would be unlikely to admit he is in pain. Additionally, he would enjoy seeing Yuzuru break his perfect, always in control persona when he gets worried for him. Hence Ibara's mocking, unbothered expression here.