The Warping (also called "the spasm of Lugh) is a sort of trance, very similar to Berserker frenzy, in which the Warriors of Lugh twist their bodies and their minds, becoming these giant monsters, thirsty of blood and carnage and so strong to be capable of inhuman acts of violence.

It's famous one warrior who, during a spasm, cut a horse in two with a single blow of his axe and another (less expert one) , who rip off the entire arm of an in cautious Druid, who got too close during a training to control the Warping.

This trance state can be acived only by the Warriors and it is imperative for each and every one of them to lear how to control it, because, in some cases, the Warping energy may cause not only death in the ranks, but also irreversible madness and uncontrollable blodlust in the warper or, in very rare cases, open interdinensional portals due to the excessive amount of energy, builded up in the Warriors bodies.

Basically what happened to Wayne and Ezra.