When Does Luffy Use Haki In Marineford Ep [new] -

Akainu is a Logia user who turns into magma. However, Luffy was wearing a coating of Ace's blood and his own sweat/water on his fist. Furthermore, Akainu was corporeal at that moment because he was mid-attack (forming his fist) and had just been hit by Whitebeard's quake, which disrupted his concentration. The blood/water on Luffy's fist acted as a temporary, non-Haki bypass.

Luffy is trying to reach Ace. He is exhausted, injured, and desperate. Squard has just stabbed Whitebeard. As Luffy screams for Ace, he lets out a massive burst of willpower. when does luffy use haki in marineford ep

This is a common point of confusion for One Piece fans. The short answer is: Akainu is a Logia user who turns into magma