After about 10 wipes with my 5box group I finally managed to kill him with a DPS friend (6 chars all together). I seriously doubt this fight is 5box-able without heavy use of macros and a lot of extra adjustments only for this fight.
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I've tried to 5 box him as well and failed miserably :( Keep wiping on P4 when someone gets mind controlled. As I have found with doing old school raids a lot, mind control null and voids out gearing :(