Explain the significance of Chapter 11's title. "They're After Us"

People think Jim killed Huck, and some think Pap killed Huck. Either way there's a $300 reward.......... and the woman has seen life on the island. "They're After Us," means everyone........... like she says, that kind of money isn't just laying around.

"Well, you're innocent, ain't you! Does three hundred dollars lay around every day for people to pick up? Some folks think the nigger ain't far from here. I'm one of them--but I hain't talked it around. A few days ago I was talking with an old couple that lives next door in the log shanty, and they happened to say hardly anybody ever goes to that island over yonder that they call Jackson's Island. Don't anybody live there? says I. No, nobody, says they. I didn't say any more, but I done some thinking. I was pretty near certain I'd seen smoke over there, about the head of the island, a day or two before that, so I says to myself, like as not that nigger's hiding over there; anyway, says I, it's worth the trouble to give the place a hunt. I hain't seen any smoke sence, so I reckon maybe he's gone, if it was him; but husband's going over to see --him and another man. He was gone up the river; but he got back to-day, and I told him as soon as he got here two hours ago."