Action Card - Illusion Dance
Change all Attack Position monsters on the field to Defense Position. Any monster that was changed to Defense Position by this effect is changed to Attack Position at the end of this turn.
The second part of the effect says that monsters changed to Defense Position by the effect of this card are changed to Attack Position at the end of the turn. However, currently this effect is applied as if it were an effect of the affected monsters and not by the effect of this card. Thus, if the effect of one of these monsters is negated, the monster doesn't change to Attack Position as stated in the text.