As the topic says, damage bug.
Everyone experiences this not only one or two class(es),
When someone kills a person he would be bugged and he won't die as soon as his health is over instead he can run for 2 seconds and that particular person will be able to damage the other side.
Happened to me, I even killed a person when i was dead actually.
I hope this bugs gets fixed as soon as possible and i am sure Jonne will work on it.
Regards,
Fares.