It's ok to fail the mechanic. Everyone is special in different ways and we have things that we are good and bad at. It's good for the game to have a diverse range of different mechanics and challenges. Try not to feel bad about yourself if you can't do this one. You'll still be able to clear and get the loot. I doubt this particular mechanic will be repeated much in future, if ever. It's just something that fit the theme of that enemy.