It does not grant 100% fire chance, it depends on how many enemies are trying to kill you and lags.
Also it has false fire on duels and other events where something saves your life.
What is that:
An easy addon, that tryes to send your custom message to the channel (say, yell or emote) before your death or defeat.
How it works:
Scaning the combat log for incoming damage, if found overkill value then bam, you are dead, it`s time to try say something before your "say channel" will be locked in case of your death or defeat.
How to use:
type /imdead help to get list of commmands,
/imdead show to get current list of messages and their positions,
/imdead add <your defeat message> to add new message to the list,
/imdead remove <index (number)> to remove message from the list using possition (index == postion),
/imdead channel <say,yell,emote> to switch the channel.