User blog comment:Ichigostop/A Plethora of Topics/@comment-2210898-20110418161133/@comment-1984061-20110418224301

What he means is probably that Akainu used Haki in his punch which is why he was able to touch Ace.. But he didn't need to, because it goes in the manga, that as magma is hotter than fire, it can touch it, or hurt it, its the same analogy as Rubber doesn't conduct electricity which is why luffy made Enel look ridiculous.