Why we chose to oppose to a suggestion

we were advised by one individual to film another scene that would show the potential stalker with Isabelle, and the actual stalker’s gaze via a film shot. However our group disagreed with this suggestion as we felt that the enigma would be revealed. It would however possibly make the ending that much more dramatic and tense, but we believe it would destroy the enigma, which would then result in our audience not paying to watch it as the film would be predictable.