Easy. There's a scenario. Then questioning. You question the above persons scenario then give yours. It's Suspectville. Your required to give a scenario too. Then your story will also get analyzed, etc.
Jack proclaims I have been at the well or I was fetching water.
Then Jill says O rly? I suspect that you were and so on and so forth...
(What was up with you?) Jill says I was at the dormitory.
Jack says O rly? I suspect that you were...
It's not limited to setting. It can be anything else.
My scenario: Jill and I were chilling and just talking.
PS. Question mine then expect to be asked what was up with you. Don't worry over exact procedure. Enjoy!