[Bucky's arm buckles and he makes the fatal mistake of instinctively trying to block with his other arm... the arm that isn't there any longer. His eyes widen in surprise as the letter opener plunges into his face, though it thankfully just goes through one of his cheeks to flood his mouth with blood.
It's like a switch flips inside him and all his training takes over. Ignore the pain, take out the target, conserve the Soldier's life. He twists his head to wrest the letter opener from Clint, tearing his face more in the process with a grunt of pain, and pulls his aching arm up to pull it out and flip it around in one smooth motion to try and stab Clint right in the throat.]
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It's like a switch flips inside him and all his training takes over. Ignore the pain, take out the target, conserve the Soldier's life. He twists his head to wrest the letter opener from Clint, tearing his face more in the process with a grunt of pain, and pulls his aching arm up to pull it out and flip it around in one smooth motion to try and stab Clint right in the throat.]