He looks... surprised. For a moment, he just stares at the older man. Expression softening a bit, he actually smiles and looks down. Make himself essential, huh? After a couple of seconds, he nods, "...Right."

Sure the words were from a stranger, but they reminded him of a certain someone back home. It was a welcome nostalgic feeling.

Senji would have kicked his ass for acting how he'd acted, though...

Forcing a firm expression, he nods and looks back to the covered man, "Thank you."

Mentoring, though, is not something he's so sure about. Maybe he could learn, though.