Figured this one out the other day going for Glory of the Hero and my red protodrake.
There is one of the harder achievements in Glory of the Hero in heroic Occlulus which requires you to clear the instance in 20 minutes after the first boss' death.
The exploit to save around 5-10 minutes is to:
1) Zone in normal occulus
2) Kill the first boss and have everyone select their according drake
3) Die to the constructs (do not zone out manually or jump out of the instance as you will lose your drake).
4) After everyone dies switch to heroic mode
5) Zone in and you have your mount without killing the first boss
6) Kill all but 1 group on constructs
7) Engage the first boss and kill him then immediately mount up and head towards the last group of constructs you left alive.
This will aid in your speed run as it will avoid all of the clearing of drakes besides near the 2nd boss, and all but one group of constructs. The rest of the 20 minute achievement is really up to your group as long as they know the final drake fight almost any group can pull it off.