One obvious option is that Harry might have chosen to commit to sending a note back with opaque instructions to himself either way, even if no test were being performed. In that case, getting the note would mean only that he returned in one piece. Is there an advantage to that?
One obvious option is that Harry might have chosen to commit to sending a note back with opaque instructions to himself either way, even if no test were being performed. In that case, getting the note would mean only that he returned in one piece. Is there an advantage to that?