Answer: Pip and Magwitch encounter (C.) Compeyson on the river as they try to sneak away and finish their journey to the ship.
Step-by-step explanation: In chapter 54 from Dickens' Great Expectations, Pip together with Herbert and Startop tries to help Magwitch to escape. Eventually, Pip suspects they are being followed, but, in any case, they decide to spend the night in the Ship. The following day, Pip confirms his suspicion and realizes they are being followed by a boat. When the boat gets closer, Magwitch recognizes Compeyson, a criminal who hates him, as one of the men on the boat and attacks him. As a result, both of them start fighting below the water, but only Magwitch comes back to the surface.