[Zebra_Fact_Man]

Face it: there is no legitimate chokehold for this game. GDC has made it very clear that they don't want any teams breaking the basic game mechanics. From height restrictions, to no-touch zones, to defensive limitations, everything is very cut and dry.

And the one possible break, involving blocking the return passages, someone was smart enough (read: dumb enough) to ask GDC if it would be ok to break the game before they actually did so, to which GDC heavily disincentivized (G21).