A Master Swordsman will only showcase their Signature Technique when Necessary or Angered,
Just like Oda used those Weak Allies to force Shanks to Use Divine Departure, He must think of another Scenario that fits Mihawk's Character,
Imo Mihawk is definitely revealing his Signature Attack against a Marine, and i think it's Fujitora,
I think it's gonna be like Zoro vs Zombie Ryuma or Kyros vs Diamante
Meaning Fujitora is gonna be Bullying Someone (Like Brook/Rebecca) who i believe is Crocodile,
Then Mihawk (Like Zoro/Kyros) steps up, the Fight is gonna be similar to Lucci Fight, meaning it will look Even, but then Mihawk decides to Use his Signature Technique