Cyber Gymnast [Effect Monster]
Once per turn, by discarding 1 card from your hand, destroy 1 face-up Attack Position monster on your opponent's side of the field.
This effect targets 1 face-up Attack Position monster. If an effect is chained to change the target to anything other than face-up Attack Position, then the targeting conditions are no longer correct and it will not be destroyed.
Help me understand this. A targetting condition has to be met upon activation to even attempt using a card effect. If another effect is chained to it and doesn't negate directly, then at best it can hope to remove the target and cause the effect to fizzle. But the targetting conditions were still correct, weren't they? In this case the targetted monster met the conditions, the effect was activated, and the monster was still present when the effect went to resolve. So how does this ruling make any sense?