Guild Wars 2

Anyone else getting one-shotted by the rocks in this quest? Looks like this quest is bugged, cool down on shield is way to long. Damage to siege weapons on shore is minimal, etc…Does anyone there at ANet do quality control for balance? Has anyone tried and completed this quest in the past month? If so any tips would be greatly appriciated.
HP=26K
Heavy armor=all exotic

I did this on a thief (medium armor) with 16,705hp and while one rock nearly one-shotted me, it was not quite. Most times I could raise the shield in plenty of time to block both incoming shots, and watch the target circle to dodge the rest of the time.

I beat this first attempt, and only died when I was on the shore. You either are not timing the shields right or not dodging wen target circles pop up.