Wow, that's sad. My old GT tried to jump out of the tank twice, each time losing 2-3 scales from the top of his head. Couldn't imagine what I'd do if I saw one of my fish going sideways like that.
Ah, that sucks for sure. I consider my male Jag a true prize fish, would just hate to lose him before his time is up. Sorry for your loss. Grow another one?