I seen this one in game and wanted to go back and check it out. Starting at 23k he gets 3 kills. The first kill I can handle since he seen the guy go threw the smoke. The 2nd kill I have no idea how he even seen him. I turned the drawothermodels on and that's the only way I could even notice him through the smoke, along with the 3rd kill as well.
I would say radar or luck but I just don't see it.