Moira

After the kids left the martial hall, Heero beckoned his hand toward the worried Xu Lingxun.

Yes, since the boy entered the hall, he looked hesitant and perturbed. But he still obediently approached his master.

As soon as Xu Lingxun arrived in front of him, Heero pulled the cloak. Showing the mutant child that hidden beneath the cloak.

He had guessed this since Xu Lingxun entered the hall. And also from the other kids, he heard Xu Lingxun tried to protect the mutant child from the mutant adult.

Added with Xu Lingxun's concerned look and a bulging cloak on his back, he already knew everything from the start.

And so, he sent his other disciples away under the pretense of punishment. Even though he had explained the mutant was also a human, it was not the right time to let the kids face the actual mutant. Their minds were still heavily influenced by the doctrine mutants were monsters.