"It's fine." The response was not immediate but it may as well be one. Given, Charls would have handed his coat over if Osias hadn't told him where but Charls had never been one to just sit back when he could do something himself.
He excused himself as he slipped past the doctor and found himself a spot for his coat. After that, he walked back to Osias, smoothly unlocking the buttons of his right cuff. He began rolling the sleeve back, up to his elbow. "So what do you need my blood for again? Haven't you drawn enough to last you a lifetime yet?" He certainly hated wasting resources.