In strict screenwritingstructure terms , having a climax in the third act is not restricted to any one genre in particular . For most conventional films you need to have that climaxconfrontation of some sort for the story to feel satisfying . So to answer your question , I think there needed to be a more satisfying climaxconfrontation . What exactly ? I don ' t know . I ' ve thought about it myself when thinking about why I didn ' t like the climax in this film . For me , I think that pool scene didn ' t really reveal any new information or present the character with a greater challenge . It was just a clumsy repeat of what they had been trying to do all throughout the film escape the monster . A climax feels satisfying if the character is faced with a challenge they haven ' t had to face before in the story and they either overcome it or lose . I ' m just thinking along lines of conventional storytelling though . I keep think about the climaxconfrontation scene in Under the Skin . I think It Follows needed something along those lines . SPOILERS AHEADIn Under the Skin , in that forest scene where she gets attacked , they finally revealed the alien ' s true form and then she gets burned . There ' s a r e v e lationconfrontationdefeat . It was a tragic but satisfying climax .