It is indeed not genocide, especially since the things they're shooting aren't technically alive, anyway, so Levi supports it as an idea for entertainment.

And they're also getting paid, that's always a plus.

It's not a clean shot, but with the other ship slowed down, it should be easier to outrun and maneuver around it. Levi lets their own boat sail a little further, just to make sure there's enough room for turning, and steers them after the ghost ship again.

"Take the chain shot," he yells at Eren over the voices of their few crewmen struggling to keep up with following the captain's orders because he's not saying half of them aloud (but luckily, the ship's turn is completed successfully this time).

At least they know some shit about artillery, since they did have cannons and variety of ammo back home. And considering what chain shots could do to titans, not to mention the much more generous margin for aiming, Levi's quite confident it should decimate the other ship's masts sail poles quite easily.