I guess I'm a little late to this adventure. Open world games get so complex for me that I always end up not understanding anything (Typical me). Still, it's good to read a bit about it.
That part against the jellyfish looks entertaining, I guess you exercised those fingers like never before, you can tell that battle was hectic.
In the end it's always better to leave still what lies still hahahaha.... Even I would leave it on one side after dying several times in the attempt. This is something that at least I end up seeing positively from these types of games, you can opt to take another course and come back later, well although for you I doubt it, I don't think you would have been left wanting to go back there xD.