Good movie, but a better ending would have been...

I enjoyed this movie. I think it was more intense and scarier than The Shallows and had a similar dark tone to The Descent, which I like. I would make one tweak to the ending to make it more interesting. When it is revealed to the audience that Lisa is hallucinating and laughing, the camera should continue to zoom out, with Taylor helplessly calling to Lisa as she continues laughing, and then finally fade to black, leaving it ambiguous whether she's rescued or not. What do you think?

Makes sense that I prefer this ending the same way I prefer the similar ending in The Descent.