Defense and rebound!
This kind of rebound was not a reflection. It was truly a rebound. For example, Lu Kang could use his energy field to condense a fist mark or slash out a saber light from afar. The moment Xu Tui's Vajra Shield caught it, there would be a process of internal rebound.
It bounced back.
Of course, whether he would reflect back and injure the enemy or strengthen his defense depended on Xu Tui's own micromanagement.
For example, using the concave Vajra Shield to receive the attack before rebounding had a high chance of rebounding the enemy's attack. If the Vajra Shield actively rebounded before the enemy's attack arrived, it would be strengthening its defense. It was equivalent to attacking to assist in defense. It could increase Xu Tui's defense by several times. Xu Tui's methods of dealing with super-strong offensive abilities were even more varied.