My guild has been 17-25 manning Loot Leviathan AKA Flame Leviathan in Heroic Ulduar.
While setting up for one of these runs we suddenly had … mobs. Two Runeforge Sentry walked through the protective bubble. They then proceeded to start twacking people around their feet.
Mounted, I ran for the stairs. You know… to watch the show.
We don’t know what happened but they eventually reset.