Thanks .I tried but I couldn't find it. Did you manage to find his/her username?

http://battlelog.battlefield.com/bf4/servers/show/pc/894ac35a-b497-480e-a343-48e03d4a26bd/YIGR-WAR-HELL-only-LOCKER-25-7-www-yaigrovoy-com/

sure let me send

I was playing on YIGR locker only server and came across this player who killed me in ways I could not understand several times.That's when I decided to leave the game and watch her play and found this which looked suspicious to me.She got kicked and I think she instantly  changed her username

She also talked about having multiple accounts

server link:  http://bf4stats.com/s/pc/894ac35a-b497-480e-a343-48e03d4a26bd

video evidence : https://www.youtube.com/watch?v=qk2VuYlpBHQ&t=6s