Whacked Sedna

Platform: PC
ISP: TPG Australia
Type of Internet Connection: ADSL
Internet Connection Speed: ?
Date & Time: 11:50PM approx
Frequency: once (first time today)
Character Name: Mayoyama and Mayonoshiro
Race: Taru
World: Bahamut
Main Job: Mayoyama -NIN/WAR, Mayonoshiro - WHM/BLM
Area and Coordinates: Abyssea Vunkerl - the circle area (through the narrow passage) next to the pugils
Party or Solo: Duo
Monster Name: Sedna
Steps:
NB: NIN had RR/Apoc/Lake Lurker atma at time of popping
1. Popped 1st Sedna on WHM
2. Killed without any issues
3. Popped second Sedna on NIN
4. Brought it back to camp
5. Sedna was acting fine for first few minutes, then suddenly "glitched"... spamming TP moves at a much faster rate than it should be (not even stopping to cast magic for over 3 minutes) causing the NIN to eventually die.
6. WHM tries to hold it but due to it spamming tp moves and silence aura, whm eventually went down also. Nin uses Mijin Gakure and reraises (using apoc atma) to unweaken just before whm dies.At this stage, Sedna was at 8%.
7. As whm dies sedna doesnt go truly passive (where it just sits long enough to be taken again).. but runs at almost flee speed back to its HP spot about 80 yalms away by which time it had already regened to 50%+. Nin was up and tried to provoke sedna but kept running away way too fast and depopped before NIN could get close enough to try to provoke again
8. Raged and logged out.

I've fought Sedna many times and its a pain.. but never seen it go that ballistic ever....