Should it be illegal to steal someones kill on Call of Duty?

So i have just been playing some Call of duty black ops 2 when this kid kept stealing my kills. It was the same person over and over. Everytime I went for a kill, this kid just ran in and took it. 11 assists I got, they should of been kills. So I think you should be put in prison for stealing someones kill in a fps.
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