Forum:Noble knight drystan

Hi guys, i know that this card doesnt come out until the next week but this doubt come to me. The effect of Noble Knight Drystan that wich say: While you control another "Noble Knight" monster, your opponent cannot target your monsters with less than 1800 ATK, except this card, for attacks or with card effects.

What happens if i reduce the atk. Noble Knight Drystan with noble arms arfedutyr? i mean he no longer has 1800 atk, i understand that the exception is because he has the 1800, but if he doesnt has the 1800 he can protect itself. But im not sure please help me with this doubt. Thanks