Look for most of you that responding to this thread and saying L2Play to the OP. You must just chill the F out and listen. This is a serious issue. Not only has this happen to me in The False Emperor HM but it has also Occured on the Esseles and a couple other Flashpoints.
Here is the mechanic that is flawed:
The COMPLETION of the mission is tied to the death of the final boss.
It is not tied to the looting of the corpse or the loot box.
So if you die, and lets say die just as the boss is killed and glitch to where you can't get rezzed, in my case partially in a wall. You have to release but you can not reenter the FP. Why? Because it is already completed. This means No loot!!!
Second, on Darth Malgus if you are kiting him to the edge at the end of the fight and he knocks you off, then you immediately leave the instance. Your guys have seconds to kick him off the edge and complete the instance. Guess what? YOU CAN NOT ENTER, NO CREDIT for the hours in the FP and NO LOOT!!!
Bioware, must not block you from Re-entering the instance, or tie the end of the instance to the looting of the final boss or Loot box.
What this also means, is no going back and taking out the bonus boss. Why? Because if you die you are completely stuck outside the instance!!!