Brenneri - specifically Bioluminescent

[LordAzune]

I'm just reading through my copy of galactic ancestry and something struck me as odd.

The heritage for Bioluminescent at the bottom states: You are not off-guard while in water, and you don't take the usual penalties for using a bludgeoning or slashing melee weapon in water, or to ranged attacks made underwater or against an underwater enemy.

While I understand the second part being beneficial.. the part I'm focused on is "You are not off-guard while in the water".

What is the actual point of this statement?

For clarification: I don't mean "What does not being off-guard in water mean", I mean... they have a swim speed and are already by default not off-guard in the water.

Am I missing something or was this just pointless text/portion of the ability?

[Perses13]

This seems like a case where the writer simply forgot that Brenneri have a swim speed or that that negates off-guard and it wasn't caught in editing.

[Finoan]

It does have the very niche use fringe benefit that if something somehow manages to remove their swim speed, then they still wouldn't be off-guard in the water.