Cuando declara la activacion de esta habilidad, el luchador fija a un adversario determinado como blanco y entra en una modalidad combativa con una duracion de cinco asaltos. Duranta estos Turnos, todos los ataques que realice contra dicho enemigo no le hacen perder puntos de vida, aunque debe apuntarse por separado el dano teorico que ha causado cada uno de ellos. Al finalizar el quinto Turno, el personaje suma todos los puntos de dano que deberia haberle producido a su adversario con sus ataques y, a continuacion, elije una de las capacidades especiales de siguiente lista
Which Google says means this:
When you declare the activation of this skill, the fighter sets a determined adversary to target and get into a fighting mode with a duration of five rounds. During these shifts, all carried out attacks against that enemy does not make you lose life points, but it should be noted separately theoretical damage that has caused each of them. At the end of the fifth inning, the character adds the damage that should have produced his opponent with his attacks and then choose one of the special abilities list
So we basically get no further to finding out how this works.
SO there still
isn't a statement as to whether or not the target enters the state with the character, whether or not that state is time-related
rather than just for a lack of damage on the state's duration (which one hit would simply make the attack cease to be at all unless you absorb, and that can be dangerous due to character death prior to maneuver completion)
or any game-related reference to the term "lighning-fast attacks" in the description of Etherial. I have trouble seeing anything fast about this technique, showing far more cons than pros in it's use without further adjustment. Most definitely an editing issue in any language.
Personally I would house-rule it or chuck it. Too many questions as to how to use it otherwise.