“But of course, everyone can see that the helo was destroyed.
So what exactly was on fire in the video shown for a couple of days after the kill”
huh? The helicopter was destroyed using explosives. The explosion probably tosses this piece out of the resulting fire.
FWIW, graphics I’ve seen show the tail slamming a wall and falling on the other side. The SEALs used thermite grenades etc to destroy the fuel-laden fuselage. The dry, fuel-less and relatively intact tail rotor section on the other side of the wall survived relatively intact. Burning it would have been very hard. It would have taken time to ensure it was completely destroyed (the tail section).
Or you could believe the Pakistanis.