he can't convince the people around him to stop fighting for their cause but he can support them and protect them best he can. and this sentiment reaches into the present day with chihiro
he's powerless to interrupt the delicate forging process but he put his trust in kunishige and that trust brought them to this moment and shiba knows they have to keep going even in the face of another devastating loss (mini thread)
i think about the shiba's hesitancy to fight and take unnecessary risks a lot and this is the first moment of that after the irishima talks. he's fearing of the life of his best friend but he's loyal to a fault and he can't change who he is so he has to stay by kunishige's side