[i]Damn that gunslinger's hands and their supernatural speed![/i] His own hands might be that fast in a punch, but a drawing motion was far from his practical training. Probably because he didn't conventionally use firearms. 

Ducking back behind cover he felt the breath of wind from the incoming fire, he reflexively pulled his head away from the bullets even though they had gone past him. The bark of gunfire still rung light in his ears as his weapon arm tensed. He looked down to find that a bullet had found province in his left shoulder, clean through. Missed the bone but blood was pouring from the wound, barely visible behind the black veil of his sleeve. The blood was only sighted down the arm where the sleeve had been torn by the wires sent by the staff. 

"Great." He muttered to himself as he turned back around the post, beginning a very brisk sideways walk. Shin kept his left hand totally straight forward as he let off a series of shots down the sight. He wanted to put it between his heart and the Old Gun's bullets. The staff was tough enough to take a shot for him without failing, he didn't want to catch a bullet in the chest and flop. 

As he made his sideways advance he kept his right arm down to his body, there was no need for it in this fight. It felt awkward not actually using both hands at the same time, totally against his nature. He fired off shot after shot, numbering a total of eight shots. Every single one of them was a spinning blade, the blade format was best for a lower speed weapon. It gave more coverage than a bullet and had a predictable trajectory. As he moved sideways the projectiles would move closer and closer to Jonah until the post would no longer provide sufficient cover. 

Every shot was aimed for center mass to knock him down rather than immediately kill him. His reasoning would make sense much later.