Liu Mei was surprised by Song Yahui's speed, but even after seeing his sudden attack that was about to hit her stomach, she didn't attempt to defend and instead she closed her eyes, as she kept her full focus on maintaining the black hole open so more of her undead creatures would arrive.
Liu Mei knew that if she lost focus even for a while, the black hole would close and her undead creatures would stop pouring out.
Of course, it wasn't that Liu Mei didn't want to defend or that she thought that Song Yahui was weak, but Song Yahui was simply too fast, causing her to not have enough time to defend.
Less than 200 skeletons had come out from the black hole by now, and they had barely managed to slow down Song Yahui for a single moment before he effortlessly tore through their defenses and arrived in front of Liu Mei to land his attack.
Of course, Liu Mei wasn't entirely to blame for this either.