Hi everyone! It turns out that shape we saw coming out of the ocean was FRANK MUTO (If you remember, Delia's dad, the girl who Hugo put in a coma, so her dad wanted to kill Hugo, which is pretty much what put the whole adventure in motion in the first place.), and Frank Muto is carrying his own foot, and he has hooks and fishing poles all stuck in his body. Bleh.
Allison asks him where Hugo is. Frank says that he tried to kill Hugo but they fought and Hugo overpowered him and threw him overboard. And he must be lying, because that goes against what we read in Chapter 80. (Back then what we read was that the chain got caught around Frank's foot and that is why his foot came off, as Hugo was going overboard.) Well I guess he's not really lying, just not telling her the whole deal.