User blog comment:Omega natsu2/Tartarus Arc: Part 3 - King of Hades/@comment-5840892-20140401032402/@comment-7418318-20140403212301

Because that's just a guess and not irrefutable truth as you make it out to be.

Natsu was almost absorbed by Franmalth and later Franmalth absorbed his magic and still nobody is saying "Natsu can't beat Franmalth, because his magic and he himself would be absorbed."

And yet everyone seems to be crying that crap about Lucy's spirits immediately being absorbed.

We didn't see how it happened, so saying that her spirits would be instantly absorbed is pure speculation. Most likely it'd be the same as with Franmalth almost absorbing Natsu, but Happy interrupting the process.

Or put otherwise. Everytime Franmalth links with a Spirit and tries to absorb it, Lucy hits him with her whip and thus prevents it from happening.

That's not any less speculation than the spirit being instantly absorbed, but it makes a lot more sense in my opinion.