I've never seen anything like that on Tonberry thou.

People on my side are so geared these days that of the roulette (trails) I did, I've seen one healer fell immediately after heart and the other healer just solo healed for the rest of the fight. Another time 2 DPS were dead or fell IDK, just saw them at 0HP for the rest of the fight and left me and another melee to kill Titan off.

No wipes, just one-shot, despite all these.