[The benefit of Naruto being incredibly expressive is that Sai can tell immediately that something is wrong, when he wouldn't have picked up on anything off about Giorno's words on his own. Unfortunately, though he can tell that Naruto is upset about something, he can't quite figure out what it is.
Which leaves him a bit at a loss, here. He doesn't really know how to react or what to do, but he thinks he needs to do something, because the other thing he knows about Naruto is that he doesn't hesitate to challenge those that could easily fucking kill him--and while that's one of the things Sai unconsciously likes about him--something about him instinctively feels an urge to keep him from doing something stupid and dangerous. He might be friends with Giorno, but he doesn't know enough about him to be able to tell how he will react if Naruto engages him first.
Some kind of long-buried sense of reflex has him reach out, put a hand on Naruto's shoulder. It kind of sits there, uncertainly, as if he's not sure what he's doing with it; half a weakly protective gesture, half a vain sort of gesture toward pull Naruto back from confrontation, if he had the mind to evaluate the action deeply at this moment.]
Even powerful ninja require medical assistance at times, Naruto. That--is why Hokage-sama maintains skill in both combat and medical ninjutsu, yes?
Giorno-kun ... Giorno will be a good ally for us. We can trust him.
[And part of that is a message to Giorno, in its own way, a signal (albeit not entirely intentional or conscious) toward Sai's priorities, of Naruto taking a higher place than Giorno.]
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Which leaves him a bit at a loss, here. He doesn't really know how to react or what to do, but he thinks he needs to do something, because the other thing he knows about Naruto is that he doesn't hesitate to challenge those that could easily fucking kill him--and while that's one of the things Sai unconsciously likes about him--something about him instinctively feels an urge to keep him from doing something stupid and dangerous. He might be friends with Giorno, but he doesn't know enough about him to be able to tell how he will react if Naruto engages him first.
Some kind of long-buried sense of reflex has him reach out, put a hand on Naruto's shoulder. It kind of sits there, uncertainly, as if he's not sure what he's doing with it; half a weakly protective gesture, half a vain sort of gesture toward pull Naruto back from confrontation, if he had the mind to evaluate the action deeply at this moment.]
Even powerful ninja require medical assistance at times, Naruto. That--is why Hokage-sama maintains skill in both combat and medical ninjutsu, yes?
Giorno-kun ... Giorno will be a good ally for us. We can trust him.
[And part of that is a message to Giorno, in its own way, a signal (albeit not entirely intentional or conscious) toward Sai's priorities, of Naruto taking a higher place than Giorno.]