Hey guys, i noticed something when we went to kill Ahune today for the first time and i thought I'd let you know.
So, normally you would clear the instance up to his spawnpoint, summon him, kill him, reset the instance and start anew. By using this exploit, you can summon him in the same instance without resetting/clearing mobs again and you WILL GET LOOT AGAIN.
I myself only tried it in normal, so if someone could confirm this in heroic mode it would be greatly appreciated.
You are supposed to kill him by damaging the Frozen Core in his second phase, but you can still damage him while you're dealing with the adds. It's reduced by a percentage, but just keep this fact in mind.
The trick is to not kill him in his Frozen Core-Phases. Instead, you just damage him down to ~5% and have one or two ranged dds kill him while your tank is collecting the new adds. This way he dies, but the stone ro summon him immediately respawns.
Please excuse any grammatical errors in this post as I'm a german player.
tl;dr: Kill him while he is spawning adds, you can resummon instantly.