A fuel dump / ignite looks like a nice cheap way to down a balloon.
We actually DON”T KNOW if there was any damage to the fighter, or, for that matter, unseen parts of the drone’s tail.
Note how slowly the drone’s prop is turning, even B4 the 1st pass by the fighter (that we see). Possibly the operator successfully restarted the engine and then vibration was a problem? Either way, the drone was now effectively only a glider.
Maybe the Russian pilot thought the drone was coming down too slowly or the engine might get restarted, and decided to get more aggressive, tried to damage the drone with wake turbulence?
Well, at least he didn’t try to damage the drone with woke turbulence. That’d REALLY confound some of the crowd we have on here! ;-)
Sorry to get back to you so late. Long day yesterday getting ready for a relative’s visit.
Anyway…
The seeming slow rotation of the prop is due to stroboscopic effect. It is an optical illusion created when the rotation speed of the prop is an even (or nearly even) multiple of the frame rate of the video camera. If it is an exact match, the prop seems to stand still. If it (the synchronization) is slightly off, the prop appears to be rotating very slowly. Pull up some YouTube videos of C-130, etc. on the ground with engines running and props turning, and you’ll see the effect.
The best ones are the big turboprop aircraft with counter-rotating propellers like the Airbus A-400, or my favorite, the Tupolev Tu-95 Bear. Then you get to see eight propellers come into and out of sync with the video camera as engine speed is throttled up and down.