The news have been circulating for about a week already, with more screenshots and videos emerging.
Azeris' struck Armenian S-300PS battery near Kahut on 10th October. Supposedly, the attack was executed using Israeli made Harop kamikaze drones; one can also assume that Azeri drone operators were briefed by Israeli specialist on the proper tactics.
A 36D6 Tin Shield (19Ж6 ) surveilance radar got destroyed:
Today, a strike video on the Tin Shield from on-site surveillance camera has emerged on Youtube:
You've got around 4t of propellant, and half a ton of HE in each full launcher. That is enough to make a pretty nice bang and to burn for some time after, with the fuel from the launch and support vehicles added in... plus the saturation of the seeker from the intensity of the explosions and fire making it look bigger than it is.