Since Count George already lost enough of his face in front of his citizens, he decided not to use the low-ranking forbidden spells as he already used them twice and both didn't work against Yuan.
And despite them being forbidden spells, they couldn't even put a little scratch on Yuan's body, which is a great disappointment for him and also an embarrassment.
And since the two forbidden spells didn't even make a scratch on Yuan's body, despite the spell possessing the destructive power of lightning. Therefore, Count George decided to take a risk and used his most powerful forbidden spell which is a Tier-6 spell, not many people know about this spell except for his wife and his butler, who isn't with him at the moment.
Your gift is the motivation for my creation. Give me more motivation!