DPS or someone gotta make sure they got a DOT on him... Shouldn't be an issue as long as everyone isn't going to let someone out of jail... Oh wait... I think I know what's going on...lol
This is not the issue. The tyrant will reset any time someone trapped gets aggro. This happens fairly often whenever the tank dies during a trap phase. It also happens when the tank gets trapped. (though I've only seen that happen once) As soon as you see the tyrant heading towards one of the cages, you know he's about to reset.
I really hate this bug. At least the team i was rolling with didn't get all dejected and were still able to complete it.