I've played many matches where a guy on the other team gets 40+ kills and doesn't t bag at all. I've noticed that the people who TBAG are those you kill over and over again and then when they finally one-up you and take you down with final round, Felwinter's or thorn, they TBAG you. I've never experienced tbagging from players who were legitimately good, it's always the scrubby ones who keep blinking towards you and get killed until their crap tactic finally works.