Ethan is ghostface! Your doing whatever you do everyday until you get a call you answer and then ghostface asks you questions and if you got it wrong Ethan would die

You get most of them right until you got the last question wrong and you hear ghostface say "I'm afraid someone gonna die" as it showed a video of ghostface pointing the knife at Ethan from outside of Ethan's house as the killer hangs up

It was a trap as the killer was waiting for you at the door