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Even before the Crown Prince lead the retreat of the forces. Raven and his friends already retreated back to the entrance of the cave.
The Ruler's Vision was already turned off by Raven, he figured that the kingdom had seen enough and there is no longer any need for them to see the results of the battle.
As the forces of the Final Haven Kingdom retreated, Raven along with his friends didn't leave. They stayed and watched as the Golden Knights battled the Devil Prince. As everyone was busy leaving the premises, they weren't able to notice that the kids actually stayed.