Was this ever explained?

[Kayokane]

I can answer #2 for you: You were holding your gun like a 'pirate' does, the Barracudas are trying to keep 'pirates' out of their ranks.

[Valmonte]

I can answer #2 for you: You were holding your gun like a 'pirate' does, the Barracudas are trying to keep 'pirates' out of their ranks.

Actually no, the pirates don't use guns.

the whole jelly fish scene was an echo, actually Stahlman only shows up during the echo the entire limsa storyline the commodore and the man you see swatting the jelly fish are one in the same. during the barracuda CS you aim your firearm the same way Stahlman did during the jelly fish scene. if you follow the story all the way through Commodore Stahlman betrayed limsa to the sahagin to get the horn and he's supposedly dead or in exile.

so in simple terms you used the gun form of a man thought to be dead, that betrayed all of limsa, to get his hands on a powerful horn artifact. anyway the horn artifact in the present time had made its way to uldah, how the shadowless elven sahagin servant managed to lose it is never explained.