His grunts were scared of Mihawk of course they wouldn't attack. Plus Mihawk is WSS which everybody easily recalls as a Yonko level threat. This is like saying they would attack Whitebeard, Big Mom or Kaido if they come in.
Shanks himself was already touching his sword ready to attack Ace if he didn't started to talk about Luffy.
We don't know who attacked first.
Shanks himself was already touching his sword ready to attack Ace if he didn't started to talk about Luffy.
We don't know who attacked first.
That's why shanks is sending a messenger first