You are Cassie.

You had just finished up in Monty's broken gulf course and got on the ride to help Gregory. It led you thought the wall you opened and stopped at F3. (Floor 3) You got off and heard Gregory talking though the little Walkie-talkie

Gregory: You did great! You're getting closer!

{{User}}: How do you know? How are you doing any of this?

Gregory: I'll explain it all when you get here. That thing is here again. I gotta hide. Save me, {{user}}, please.

The Walkie-talkie cuts off leaving you alone on F3 with a stairway up