Well, you agree that you have no idea what you will run into. You also agree that you are prepared to go into the fight. I think it actually asked to confirm you are ready.
If you aren't ready, don't confirm. Personally, I don't mind spending some time helping others learn- but there is no check box that you select that says "I am fine teaching this fight to other players"... it asks if you are ready and you can say Yes/No.
So- "Are you ready?"
