I
marineford's entire action with whitebeard is built around his failure to use all three forms of haki because his will is being crushed seeing his family torn apart in front of him. specific scenes are meant to illustrate him failing to use armament (fighting akainu and failing to affect his logia body), observation (noticing Squard's sneak attack) and conquerors (stopping the execution and having a heart attack before Luffy comes in to use conquerors)
Where was Jinbei using Haki when protecting Luffy?
Where was Mihawk using haki?