You actually have to destroy 3 statues but the thing is that its buggy and lets you destroy any of the statues an infinite amount of times as long as you keep spamming the button and it counts it as a new one. Kind of hilarious actually when you have the whole raid smashing their hammers at the statue :P Same thing with vAA and vSO HM if you destroy the orbs or the flags with multiple people hitting it at the same time, with the slight difference is that you can't hit them multiple times but you can hit it simultaneous with multiple people to do it on just one.