I don't see what's the big deal about this AZ.
We're engaged in a fierce battle against an "ARMED" militant organization which is getting its arms and ammunition from within and outside the country. They are experts at creating IEDs and suicide jackets. Recently, these insurgents became so desperate to hit our armour, they were carrying at least THREE 155mm artillery shells per individual, attached to their chest with a trigger mechanism for explosion. An improvised version of a suicide bomber that we've never seen before.
Anyone knows what happens to an armour if three 155mm artillery shells land directly on top of its turret or anywhere even near its armour? That's right, TOTAL annihilation. Now imagine this AZ up against that enemy which can pop up from any direction. The terrain doesn't help either. Our enemy is actually quite smart and that's exactly why they are able to improvise weapons of destruction, into roadside bombs and unconventional suicide vests.
This AZ was probably destroyed by multiple RPG-7 rocket hits. IED is another possibility. The point is, its warfare. We've been obliterating our enemy, and they've tried their level best to damage us. So what's the big deal if we loose an AZ? by the looks of it, it'll roll right back out on the battlefield after a quick visit to HIT.