Not sure what role this plays, or how much cast members may be aware, but, in a strange twist of the law, you can walk away from a dying person (example, drowning child), even though you could have (morally, should have) helped, and not be held liable.
BUT IF you choose to help (i.e., guests in this situation) and you cause more harm to the person, or if you start to help and then leave, you can be held liable (for example, you pull the child out of the water, but don't give proper CPR).
Basically, once you get involved in that kind of situation, there can be legal ramifications, whereas there are none if you don't get involved or help. I don't know if that plays any role here in what happened.