What does Hank say he'll have to do if he goes to the plane in Chapter Nine? What is Sarah's response?

Hank says that if he's going to take Baxter to the plane, he has to return the money. Sarah says that they can't after all that's happened. Sarah then says that if the agent is Vernon Bokovsky, he and Carl are the only threats to Hank having the money. She says that Hank should simply stay away, but Hank argues that if Baxter is Vernon, he'll kill Carl.