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Everyone on BLU must have been terrified. I know I would be.
To sufficiently neutralize that would require an equal number of spies or snipers, or a mix of both. The spies would be mowed down if they all show up, though, and to keep them from respawning, they'd have to. And the snipers don't have time to charge, so it's either peep out and shoot or have three times the number of snipers . . .
or just have an army of spies DR cap. --- "Memento Mori, if the nineth lion ate the sun" - Zero Escape: Virtue's Last Reward (and no, that is not a typo)