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Servidor: US East - StopWatch 7vs7 - 04 - StopWatch
He exit in game and get 50.000 score and no screen you score because i use imp paint 
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servidor: US West - objetive 8vs8 - 07 - OBJETIVE
Sorry for post in general discussion
Press in Tool Zoom For watch the screens
@mendaciousPole As far as I know once you no longer can report a player while in game you should contact customer support here
https://support-dirtybomb.nexon.net/hc/en-us
or send a private message to RazielWarmonic reporting the issue. Making a report here does not seem to be the best way to go from what I have seen.
I can understand your frustration though. 
@RazielWarmonic
Please refer to this thread on how to properly report a cheater. http://forums.dirtybomb.nexon.net/discussion/17853/how-to-report-a-player/p1