Sorry if this topic was discussed before! We all know shanks arrives at war and saves Coby from Akainu then declares to end the war! And little time skip, during Ace and WB burial Shanks says to himself that he was surprised to see what Ace did there. Shanks recalls while Ace was running with Luffy and how Ace returns to challenge Akainu after he insults WB pirates!
So the question that came to mind was how did Shanks saw that? I always thought he arrived after Ace’s death, and if he’d arrive before his death what might be the possible reason behind not saving Ace from Akainu?
[I have yet to reach reading MarineFord arc in manga, so this post is based on anime only][Whitebeard and Ace funeral](https://youtu.be/OmxD-vqr0QQ)