Haytham and Connor at the final Fort George scene. They're fighting and, somehow, either Haytham or Connor convinces the other to lay down his arms and actually listen. Just when it seems that one may have converted the other, a cannonball hits a nearby wall, and both are knocked down.

Whoever was doing the convincing gets up and finds out Connor/Haytham was knocked unconscious and heavily wounded by debris. He carries his son/father to safety.

Fast forward some time, whoever got out relatively unscathed helps his organization win (either Templar or Assassin). But he's concerned because Connor/Haytham hasn't woken from the injury at Fort George. It soon becomes obvious that his son/father has gone into a coma and won't wake up and, heartbroken, whoever got out unscathed and ended up on the winning side ends his son/father's life to give him a clean death.