Sharlin tries very hard not to laugh as Squal and the boat shoot back up.
That's weird . . .
"Maybe he's just lucky."
When the boat got nearby, Sharlin helped Winter on, and then climbed in herself. @Lord Spirit
Or or or or maybe, you use a man-made gun, but manifest the Shard as a bullet that you can recall at will, use over and again, and of course shoot people with Shard soul-cutting benefits.