Right now dealing even 99% damage to opponent gives you NOTHING if teammate 2 takes opponent down and teammate 3 finishes him. If you only finish downed opponent - you only get takedown but if somebody finishes you - you get 1 death. Another problem - no existance of assists at all and it’s really unfair. So what I suggest:
-Finishing downed opponent grants you 1 kill and 50 score;
-Taking down opponent if you did 80% or more HP damage to him grants you 1 kill and 80 score (similar to “assist counts as kill” in some games) when he dies;
-Taking down opponent if you did less than 80% damage to his HP grants you 1 assist and 40 score when he dies;
-Clear takedown of opponent grants you 1 kill and 100 score when he dies;
-Clear takedown plus finishing or clear kill grants you 1 kill and 150 score;
-Every opponent damaged for less than 80% HP grants you 1 assist and 20 score when he dies;
-If opponent gets up after being taken down - you only get 1 assist and 40 score if you did 80% or more damage or 1 assist and 20 score if you damaged him for less than 80% of HP.
IMO this system is MUCH MORE clear than current and still rewards for taking down heavily wounded opponent and finishing it, it rewards finishing downed opponent and it rewards damaging multiple opponents.