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Published on Jul 8, 2012
This video goes into depth about how the exploit is carried out. To sum it up in textual information, the exploit starts with two of the same person, One being the 'Primary' (The person intending to 'boost' on his eventual demised team mates) and the other being the 'Secondary' (The first to 'die' right after the first infected is declared unless he is the first). The match starts off by the Primary making his way to the area shown in the video whilst the Secondary prepares to commit suicide to become the Infected. Once both are done, the Secondary rushes towards where the Primary is waiting and once done, either the Primary or the Secondary block the staircase, depending on whom is closest. After most or all of the survivors become infected, the Secondary prepares to block the staircase for the remainder of the match whilst the Primary shoots through the wall whenever the Infected pile up. This carries on until the end of the match or until the Secondary either dies from the Primary's bullets or fails to barracade the rest of his teammates.
To accurately see what is done and the results of such actions, watch this video here: