Possibly an engine fire in the starboard engine.......
Makes sense. The fire is on the opposite side of the fuselage from the angle of the one recording this. So you mostly see it behind the tail and back.
By the way, I tried to refresh the site 4 times and kept getting a X video load error, and the only way to view it is directly on X, so here is the direct link for others:
https://x.com/Breaking911/status/1877774378168897947