C1995 Could it be that this is the so-called barrier?(4)

Could this be the so-called barrier? iv)

Dugu Hong was also stunned. Alright, I finally understand it. He could now feel the helplessness of the colorless flames. It's not that I'm useless, it's that the enemy is too strong. They kept charging at him. No matter how good he was at fighting, he couldn't do it! It was a tiresome thing to do. Besides, there was no way to replenish the flame