As blizz hotfixed the bug that would make him continue casting flash freeze even when "killed", and thus shatter his cache during that time, a new bug arouse.
I sadly, have no Ss's of the event, but my guild, after having killed hodir after a fight lasting 7:06 minutes, got the achievement quite unexpectedly. The rare cace remained intact, and we were able to loot it. (mail dropped, the one time we don't have any resto / elemental shamans with us :yuck. However, after reading about some other people of which the same happened, i'm not entirely sure if this happens all the time. (this was in heroic mode btw, and my 10 man group refused to wipe willingly to try this out)
The theory goes (and don't start flaming me with "NO THEORIES" just yet) that if the timer expires as he is casting flash freeze, he doesn't shatter his cache, as the new mechanic prevents him from doing so...
So, how do you exploit this bug? Well, as there is nothing that can actually control at what times he casts flash freeze except RNG, you try and try again until he is casting flash freeze at the moment the fight reaches its 3 minute duration. Warning: This WILL hurt your repair bill and that of the entire raid. I haven't tried to actively bug this encounter, but i can guess that getting him to cast flash freeze at the same time as he is supposed to shatter his rare cache will take some tries to accomplish.
Good day and good luck!
And yes, the "exploit" part of this technically contains some theory, but the bug is real, and the explanation for the bug seems very reasonable to my eyes. I would then say that this is not entirely a theory, but just factuous enough that i can post it here.![]()