The way I see it, the sniper should be able to keep the defensive classes (engineer, HW, soldier) from crossing the middle but not prevent offensive classes from attacking. This is done by giving offensive classes abilities that let them cross. Conc for scouts and medics, pipe jumping for demo, cloak for spy, flamethrower bunnyhopping for pyro. However right now, with a good sniper, no one can cross the middle.
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