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Shortly after a certain idiot hits the alarm, you'll get flashbanged, after which a bunch of SWAT guys will drop in.
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Head up the stairs and sign the fan's autograph, then stand on the objective marker and plant the explosives, which will immediately detonate and initiate a scene. More enemies will attack after the scene. Go up top and join your friends at the vault door. Continue up the stairs and shoot the guards.
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Note that you already have several weapons in your menu to select from. Take out the armed bank tellers, then proceed into the back of the bank and up the stairs.
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