Why are the Talismans I Drawn Banned Again?!

…… Buyer, “Jiang, I need some talismans for self-protection.” Jiang Cheng, “This Fireball Technique is perfect for you.” A few days later. Buyer, “Jiang, there’s something not quite right with this Fireball Technique?” Jiang Cheng, “Is there fire?” Buyer, “Indeed, it did catch fire.” Jiang Cheng, “And the ball?” Buyer, “I did see it.” Jiang Cheng, “Did it protect you?” Buyer, “It left me exposed.” Jiang Cheng, “???” Jiang Cheng, “Then you would like…” Buyer, “I would like to buy another hundred million of them!”