Okay, this is the part where Roberta jumps off the branch and dives into the water. Well, they see her floating in the water and take her to shore. When Teeny and Sam are fighting about which one should do mouth-to-mouth, Chrissy comes in and then Roberta spits at her and say, "Well, it's good to know who your true friends are." She wouldn't be able to spit because earlier when the girls were dragging her to shore and when she was laying down her mouth was open so she would have swallowed the water completely.