Thinking about those scenes in the 2nd and 3rd movie where Shirou is walking towards Sakura and their similarities and parallels.
Shirou slowly walk toward Sakura, while she tries to tell him how she isn’t worth saving, it all ends in him telling her “Let’s go home”, the differences being that in Spring Song the stakes are higher.
Like, in Lost Butterfly, Shirou is walking towards Sakura and she is telling him everything wrong with her while he just brushes it all off, and in Spring Song she is actively using her shadow magic to attack him, but his body is brushing all those attacks off too.
And in Lost Butterfly, he doesn’t know exactly how to save her, but he’s willing to do what he can to save her right now in this moment, whereas in Spring Song he knows exactly how to save her, and he uses Rule Breaker and saves her completely.
I just like that the scene that ends in Shirou only offering a temporary solution but still saving Sakura, comes back in the finale with him being able to offer this more permanent solution.