Water Combat - invulnerability
That invulnerable thing happens to me a lot (sometimes it’s obstructed instead, but still nonsense as there’s nothing between me and my target) and it seems to be complete random.
I’ve seen the random obstructed hits on land mostly. But underwater invulnerability seems ridiculous. Usually it happens to me when I’m fighting with melee weapons. It’s like the enemies swim “too close” and are unable to path to me (being, well inside me.. as gross as it sounds). And then game decides there is something fishy going on and makes them reset.
On the matter same “getting too close” issue is real pain as Norn Elementalist, where your projectiles are shot behind the enemy, forcing you to move around. Which is naturally a bad idea underwater having ridiculous agro ranges.