Forum:Yu-Gi-Oh! ZEXAL manga Rank 19 - Effects of Level Denial

So in YGO ZEXAL manga chapter 19, the Luna girl activated a card called "Level Denial", which prevent monster with a level from attacking (http://yugioh.wikia.com/wiki/Level_Denial) But how come the two of them ignored this card effect and continue to attack each other in the following turns? The card was not destroyed, if I remember correctly. Can someone explain the contradicting progress of the duel???