Fight Night: Heliosus - Pet Battle World Quest bug report

[csabi24yume]

Fight Night: Heliosus - Pet Battle World Quest bug report
WoW Freakz link: https://www.wow-freakz.com/quest_helper.php?quest=41881&&name=fight-night-heliosus
Wowhead link: https://www.wowhead.com/quest=41881/fight-night-heliosus
Zone: Dalaran
Pett Battle Opponnent: https://www.wowhead.com/npc=99742/heliosus
Bug description: I have tried to do this World Quest several times, but it failed every time. The problem is that the opponent uses only one skill, which makes it impossible to win!
This is the ability: https://www.wowhead.com/pet-ability=1593/mysterious-egg
The opponent's first attack is still a normal physical attack, but after that he only uses this one skill. Because you can't beat him, you can't finish this quest!