This is just an easy little bug, it won't necessarily help you with getting him down in 6 minutes, but for guilds progressing on him i'd imagine it's very useful.
Two words. Graveyard Zerg. After dying / falling of your drake, if you zone back in while the encounter is in progress you can get back in on the action, you won't get locked out. This has happened twice in a row for us tonight, hope this helps =D