After confirming the mage's death, he was removed from the arena as trash while a rank S was randomly selected. Even the death of a mage during the Derlvit shouldn't be enough to stop it, but Yuriel was seriously affected by killing someone.
Yuriel didn't think too much of his actions, someone would stop him every time he does something wrong in the castle, but this was not the castle, this is the Derlvit and he just passed to another level.
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At the Grand Stand floating above the sky, someone was laughing and this time was not the Oracle. Yuriel killed one mage from Plynty and Kluster was enjoying the show.
The selection was not random, the King was choosing who was going to fight and selected someone from Plynty with the same rank to be used as an indirect threat. But he didn't know that Yuriel ended up killing the mage, which made everything better.