Perhaps add a box to where you see fit, maybe on the top right of your screen when you get a kill with the following information:
Downed! (or Incapacitation or whatever you see fit).
Player: %NAME
Distance: %DISTANCE
Weapon: %WEAPON
And if you get killed, the same box, appears but with this information:
You were downed! (or whatever word you pick, same as before).
Player: %NAME
Weapon: %WEAPON
The reason why it doesn't have distance for if you get shot is so you can't metagame their distance and tell your friends on TS, etc.
Hope you consider it!