Progress had some rough patches through AQ as certain trash packs were evade bugging, and because of that, several raid members ended up dying and losing world buffs, especially the deadly trash mobs after Twin Emperors. Even after being the second guild to arrive at C’Thun,
AQ40 Run on Warcraft Logs
You can watch
Update: Blizzard has also made a bluepost congratulating the guilds who have killed C’Thun so far in the EU.
Congratulations to the first guilds who beat C’Thun in this region: