Taken from the coverage in Milan.

"In his following turn, he Summoned Gladiator Beast Darius and attacked directly. Effect Veiler was used to make sure the Gladiator Beast wouldn’t tag out, in Main Phase 2"

Surely Effect Veiler's effect wouldn't work, because you can only use Effect Veiler's in either Main Phase. And the tag out of the Gladiator Beast is conducted at the end of the Battle Phase, and before Main Phase 2.

Yep, a mistake on the judges part there.