usually the one in the front won't fall from his rear wheel being tapped by the one in the rear and if the one in the rear has good control he won't fall over either. My team acctually practices this because it can and has happened in races before.
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Rams Cycling Team
'06 Cervelo Soloist Team record, '04 S-works epic sram and king equpied, '03 litespeed hyperion DA/Ultegra 10sp