User blog comment:IamJakuhoRaikoben/Chapter 473: Red Lightning, Review./@comment-5143845-20160215212107/@comment-5303512-20160216032318

Like I explained below, a mages magic power is derived from the Ethernanos from the atmosphere which the MBP feed of those Ethernanos trying to enter, the deathly part is over, now he is just in agonizing pain, unlike his fellow Thunder God Tribe who have been cured, those MBP are stuck inside Laxus, like mucus inside a person who has a cold. This in of itself is like a form of blockage.

Also Wahl's ability to use a Nullifier of barriers was never described as a form of magic.