Here's what i do, guy done this to me and he was down the stair way at that window. I took over the window straight across the area from his window and just kept chucking nades down his little tunnel everytime i seen him getting points. That really works at pissing someone off LOL he had probably 4 or 5 zombies piled up at the window trying the get points then BOOOM!!! Points and kills all mine
And stealing window kills is worse with friends cause everyone i play with thinks their funny when they do it. They always do it to me cause i shoot the zombies a few times then stab for the most points, and they get so pissed cause i have like 3000 points at the end of round 2 and they have like 1000.