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Here is my theory
You know when playing the game, you can skip to the latest update there are a series of questions you have to answer. I'll bet in the next update when skipping to it, the question "Did Anna take the shot" appears among them.
Assume I am correct:
*Result one, {taking the shot} Marvin molested a willing Anna, Anna being totally aware of Marvin and his tendencies totally rejects Marvin and there is no going to the pool with him. Or because option one is a two-part choice, Anna does go to the pool with Marvin knowing (maybe even be excited) Marvin will molester her again
*Result two, {not taking the shot... Jake doesn't rescue Anna} Anna lends a friendly hand to Marvin. Again, Anna has the choice of not going to the pool with Marvin (same reasons as above). Or Anna does go to the pool with Marvin but in this timeline, Anna is more a willing participant
*Result three, {taking the shot... Jake rescues Anna} It's the start of a relationship between Anna and Jake