Vincenzo Natali's horror film In the Tall Grass has a harrowing yet ambiguous climax, so it helps to have In the Tall Grass explained in detail — including how the ending differs from the source material. Written by Stephen King and his son, Joe Hill, In the Tall Grass was originally published in two parts in Esquire magazine. In the Tall Grass focuses on a brother and sister who are lured into a field of tall grass by a boy's cries for help. Once inside, they become separated and discover that the tall grass is twisting space and moving them around, making it impossible for them to either find each other or escape.
https://screenrant.com/in-tall-grass-movie-time-loop-ending-explained/