Type D-Owns syndrome has no cure.

[Captain_Bravo]

From what I understand, brain damage on it's own won't kill you. It just puts you right at death's door, to the point where stubbing your toe could do you in. Lemme quote the relevant bits from the other thread:

You'll keep flatlining if your health is below -100, -100 health + 90 or more brainloss will kill you outright, and brainloss will rapidly accrue while flatlined.
If not treated, I'd like to aim for braindeath taking about thirty seconds past hitting -100 health.

So does this mean if someone is cluwned, and then beat to death, they'll die immediately instead of flatlining?

Yep.

So brainloss lowers the amount of time you can spend under 100 health before you die. If you have enough brainloss, you'll die immediately upon taking enough damage to normally send you into flatline. Unless Cogs changed it since that post.