Changing Destiny Starfoil

When an opponent's monster declares an attack: Target the attacking monster; negate the attack, and if you do, change it to Defense Position and it cannot change its battle position while it is face-up on the field. Then, your opponent chooses 1 of these effects. ● You (the opponent of this card's activator) gain LP equal to half the target's ATK. ● Your opponent (the activator of this card) takes damage equal to half the target's ATK.