SO Chapter 83

F.F. - The Witness (1), originally Tracking Sensor in the WSJ release, is the six hundred seventy-seventh chapter of the JoJo's Bizarre Adventure manga. It is also the eighty-third chapter of Stone Ocean.

Summary
Annasui orders Yo-Yo Ma to move to the corner of the boat. Annasui steps on its head and commands it to take out everything in its pockets, unphased by the holes opening in his arm. Yo-Yo Ma pulls out many miscellaneous items from its pockets as holes start opening in Annasui's ear. The Stand explains that, as an automatic Stand, its target is fixed. It will not go away until Jolyne is dead. Annasui strikes at its head with Diver Down, but it has no real effect. Holes start to appear on his leg. Jolyne realizes that it must be attacking with the swamp water. As the water splashes onto the boat, holes appear where the water makes contact with Annasui or Jolyne. Annasui doesn't realize this however, and commands Yo-Yo Ma to speed up the boat. Yo-Yo Ma then begins acting like a frog, and goes to speed up the boat after eating a rhinoceros beetle. Even though the boats speed remains the same, the attacks have stopped. Yo-Yo Ma hops into the boat's propeller, and then hides from the birds flying over head. Annasui reveals that when he striked its head, he used Diver Down to implant a frog into the Stand's brain. Yo-Yo Ma tries to continue its mission, but is distracted by its frog instincts. Annasui and Jolyne can now rest and wait for F.F. to defeat D an G.