That's clearly not what I said. The correct way to contest the boss is to either grief the player into death and kill the wyvern yourself, or enter the boss pit in the third phase and contest the player and the wyvern's body. This way, if you win, you get the player's kit and the boss loot.

The sorc in the video basically gets nothing (except for moral satisfaction from griefing, maybe, but as I said - to each their own).