Requires Dummy account
Open the command console: ESC > Gear Icon > Under the keyboard tab select Advanced > Check off Enable Developer Console
Press the ` button to open the console and type:
map sd_doomsday_event; hostname "boost"; sv_lan 0; sv_cheats 0;
That will create your match. Choose the Red Team and put the Dummy account on Blue.
Head towards where the tickets are on both accounts and there will be a ghost there. Run the dummy account through the Ghost and kill him when he gets scared. This can easily be done via a headshot with a sniper.