If Nobunaga could physically evoke question marks, he would be now.

"No, I--" Of course I'm fine, I'm not the one in the morgue. It's not about Nobunaga, it's about Crichton, but also Arthur, probably. "I'm used to Hell. There's a reason, several, I haven't had friends before here. Are you okay? Is there anything you need help with? Or something Crichton would normally be doing with you? He'd want you looked after even more than Winona, I'm sure."

Nobunaga's default is also to look after others and disregard himself under pressure. It's easier, and then others know to look after him too.