More than anything else (and this might be of some help to Kate as well), changing the Rets off their DPS Seal to Seal of Light during the various Phase 1's made essentially all the difference. That combined with constant, circular motion, meant they rarely took a spike, and pretty much always had full health.
One Ret did die before it ended, but by the time the third Phase1 kicked in, I was sucking dry on mana, so that combined with an unlucky spike hit did him in. The other 3 rets and the prot survived. On the updside, Ahune was sitting at about only 50 or 60k when the third Phase 2 opened up.
This allowed me to complete all the Midsummer Festival events, and also got me my 50th and 51st frost badges, making me the proud owner of 5xi264 cloaks (trinkets next frost purchase).
I'd edit the over-exhuberance in my previous post, but it was written right after I downed Ahune so it's a pretty genuine reflection of the feeling of satisfaction I got from this still pretty under-geared Paladin teams success.
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