Thanks again for the help everyone. Sure enough, the drone struck the powerline when the signal started going all fuzzy. It was a 58 foot fall, so the damage isn't cheap, but salvageable. The drone itself still works it seems. Gimbal was torn off the aircraft, but is surprisingly mostly intact. And there's a dent in the top shell of the aircraft. I certainly consider myself lucky, especially considering how close it was to the water, in which case I never would've found it. Lesson taken. Don't start descending below the height of objects in the area unless you can see the drone with your own eyes, especially when you're live feed is on a small Android screen.