Kill Credit with Triggered abilities

[Shoto]

So my map is based around knocking people into hazards with knockback spells, all triggered. However, i need a system for keeping track of who killed who, so I can put up a scoreboard with kills (knockouts) and deaths for each player.

Basically, how can i check if a certain unit killed another unit with a triggered ability that deals no damage?
And please, GUI.

 

[Maker]

Store the player of unit who last knocked the unit. When the unit gets moved into a hazard, add a kill to the stored unit or player.

 

[Shoto]

Seems sensible. I'll let you know if i run into any issues.
However, if a player would accidentally suicide by running into a hazard, it would return no player. But i want to add 1 to "suicide count" for said player. How can i check if there is no player stored?

 

[Shoto]

Oh wait, i could just store the owner of the unit when the unit respawns and when a knockback finishes. So the if the "player who last knocked the unit" is the owner of the unit, i add a suicide point to the player.

 

[Vinz]

Please use the edit button instead of double posting.

 

[Shoto]

Sorry. Will do the next time.