The movie was developing well and then suddenly the writer/director was like, how can we ruin the viewers experience?!
You know when you have to write an essay of say 3 pages and you have reached the second page with great confidence but now you somehow have to revise and poop periodically to reach that 3 page limit, that's how it felt like.
There were few scenes that killed the buzz of the movie, which was otherwise a great watch.