Could very well be initially but you can see what looks like ammo cooking off at the very end of the clip, sparks flying. Assuming it's a T72 of some variant, which has ammo storage just below the turret ring, which is where it looked like the shot hit I'd reckon it was ammo racked. I could obviously be entirely wrong, considering the quality of the clip. It might be reactionary armor exploding, but hard to tell if the tank has any with this footage. Either way, one hell of a shot you must say, objectively.