Brother Bilal (Dying Light)

Good day, recently passed addition The Following and after this, I decided to read the discussion about endings, it is interesting that none of the discussions no mention Nuri, the brother of Bilal. So:
Spoilersi vaccine is blue hemosa that turns people in prygunova how Nuri nobody turned? In the words of Bilal Nouri bit already 2 month ago, I did not understand the whole story of Nuri. If anyone knows the answer, please email. Thank you.