I'm getting seriously fed up with this.
When I'm running with someone, the other guy on my team kills the guy and grabs the tag. I'm not an idiot. I'll confirm the kill. I want the damn 50 experience as I could have killed the guy as well. You do not get more experience for confirming your own kill.
I always let people confirm my kills. Maybe I should stop and start being a jerk, because apparently that's what everyone else does.