the BOS can ask you for two related text. what if i only prepared one. Can i use one of the text from the short answer section to fill in for my second one?
I'd say it'd be frowned upon. I'd recommend having some ideas about a movie you're watched or something, or alternatively make a text up if asked for two. Using stimulus is pretty tell tale you haven't prepared another.
Just quickly find a short poem or something n memorise a few quotes n techniques so that your all set for tomorrow. It's better than using stimulus as related text.