For everyone who wanted to spoil this anyways but don't understand, here's the explanation: So there's a cop, and will' mom. Will has gone missing because of the demogorgan (or I think) and it's been a while with him missing. His mom got a call and all she hears is will's breathing.....then some sort of...."animal" if you now what I mean. Then, she wasn't shocked by the phone. She calls the police, he asks, "are you sure it was will?" And she says that above. But the reason I don't bad is, the first episode (this is the second) he explains that his daughter was in the city with mom. Then a woman says to the teacher who asked, "his daughter died years ago.". So- MMMMMMMMMMMM