Follow Ace down to the south end of the ruins. The naga are merely unfriendly instead of actively hostile.
Ace says: I got these little hellions on a short leash, <name>. The naga won't attack us while we have their hatchlings.
Ace says: You ready to make their leader surrender, buddy? Okay, here we go.
Ace, with a banner on his back, leads the hatchlings through the ruins while shouting any of the following.
Ace yells: We're planning on having a special naga appreciation sale after your surrender is all wrapped up! Thirty percent off most goods we have in stock. Red light savings on Kaldorei artifacts today only!
Ace yells: You naga keep your distance. We're not kidding around here!
Ace yells: We've got your hatchlings. You better not attack us if you know what's good for you!
Ace yells: Prepare to surrender to the Bilgewater Cartel!
The party reaches the southern island.
Ace yells: Alright, naga leader, come on out from hiding and surrender in the name of <name> and the Bilgewater Cartel!
Faceless of the Deep yells: Little goblins? I remember when your race was created.
Faceless of the Deep yells: I care nothing for your threats or these naga. Prepare to be removed from existence.
Ace says: Um, dude, this does not look good. I'm out of here!
Ace runs off.
Faceless of the Deep yells: Now, young <name>, you will die!
The faceless one stops hovering and attacks the player on land.
Trivia
The quote "Now, young <name>, you will die!" may be a reference to Emperor Palpatine's quote "And now, young Skywalker... you will die" from Star Wars: Episode VI - Return of the Jedi.