All friendly fire explosion done to you is negated.

Pros:

• You are no longer a victim of HE Judge Cheaters.
• You will not go down from a massive tripmine chain reaction (for those goofballs who does that).
• You will not take damage from anyone who tries to shoot you with ANY explosive weapons.

Cons (Are there any?):

• Damage that aren't from your allies will still apply (Environment, mission, etc).

Credits: 
Offyerrocker: 90% of the code
Myself: The one edit needed to get it working.