Even though she projects such a strong sense of survival, Joanna is still grieving, often in a deeply painful, primal way. She’s so afraid of something terrible happening to the baby that she would sooner kill them both than let that happen. Until that time, she continues to obey her mother’s instinct to “run.” While the phrase “the bad man” suggests that Decker has returned, it’s not yet clear if it’s really him or not. However, someone is apparently holding the two of them captive.