User blog comment:Bunnyllove/Have Natsu and Zeref meet before?/@comment-24066070-20131111101402/@comment-24066070-20131111124824

Yeah I know it's never gonna happen, just would be cool if it does imho.

"Launching from his own limbs" was indeed an awkward way to describe it, so I'll use an example:

In the fight against Gray, the black lightning came crashing from above and wasn't launched from Rufus' hand, same happened with the tornadoes. So Rufus could most likely summon the death aura in the same way he summoned the tornadoes and doesn't need to launch it out of his body or hands like Zeref does.

I don't think the speed would be an issue, as Rufus managed to memorize and forget Gray's ice quite fast and the death aura doesn't move at breakneck speed.

But then again, Rufus is likely never gonna fight Zeref and if he does he will be sacreficed for the sake of the plot (making the main chars angry, while at the same time showing Zeref's power). Nevertheless I believe the author has given Rufus an interesting magic that should be given some more screentime and in-depth explanation.