Yellow card problem and solution

[VegaSagatBison]

I've come across an issue in the multiplayer that keeps bugging me. It's an issue which I believe has a pretty simple solution. Here's the scenario I keep running into:

I'll get an ally shooting me(usually right as the looting begins which identifies him as a moron immediately) and then running away. By the time I chase him down and kill him, his yellow card is gone and I get marked a traitor.

This is very frustrating for me because I'm not the kind of person who can let something like a blatant backstabbing attempt go unpunished. And what do I get for helping out the team and getting rid of this douchebag? I get the entire team coming after me. Great.

Solution? Any time that damage is dealt to or by the yellow card should increase or reset his timer as a potential traitor. So, in the above scenario if I were able to keep up with the yellow card and keep hitting him every so often with bullets, I could have eventually cornered him and finished him off without a penalty.

Opinions?