Im a hack.er

So... I was doing my Train TDM mission on CF, UK1 server which was under heavy lag, every game was a lag-fest. And then I joined one match and i started powning.... No one could shot me even when i was standing still. They all were acting as if they cant see me... I could knife them whenever I wanted, and I went 36-0. So I assume i was somehow invisible (probably due to the lag) to the others, but not by my fault cause i didnt hack or glitch. And I dont have any hack software installed on my PC. Did this happened to any of you others and which could be the cause for this to happen?

http://img261.imageshack.us/i/hackk.png/