For a one-hand duelist, crossdraw works. If the stage is not contradicting it, shoot the crossdraw first, Take the gun from the strong hand with the "dumb hand", (reach in ang graeb it by looping the weak hand over the top of the frame as soon as it is dry) then draw the second pistol while re-holstering the crossdraw using the dumb hand. If ya miss the bucket, just hold it safely beside the holster while shooting the second gun.