SteamID:
https://steamcommunity.com/profiles/76561197997715689
https://steamcommunity.com/profiles/76561198070932074
Evidence:
https://youtu.be/Db_kehZ_TY8?t=84
These two teamkilled the flag carrier because he wasn't fast enough, only seconds after he took the flag. Flag carrier was probably waiting to regroup or regenerate from a kick, then he gets teamkilled by players with less strategic insight. You can even see him say: "I'm low hp" "stop".