To perform this trick, you'll need either the Blade of Calling or the Black Knife (you do not need to meet the stat requirements). If in Ng+, Hand of Malenia or Hammer of Marika are superior options. Additionally, you will need a stance-type Ash of War weapon (Uchigatana) and the basic "Hammer," infused with the Ash of War Gravitas. Any weapon with Gravitas will work, but because of its low stat requirement, it is the most convenient.
While two-handing your uchigatana in the left-hand slot, apply any weapon grease to your sword. Near the end of the animation, press your ash of war skill button. Then immediately open your equipment menu and swap your uchigatana to your Gravitas-Ash weapon as soon as the game allows you to change your equipment.
Wait just a tiny moment (or you will fall) then dash forward. When you reach the other end, that's it! All you have to do is climb up the branch and grab the grace, and Godfrey's AI will be broken when you return.
