I would think Bulent meets his fellow remaining survivalists and sets up his own shelter nearby, just like he did when he met Seth. Bulent makes one kill providing the sustenance needed by Jon, Gwen, Sarah, Suzanne, and himself to make it to extraction. He then leaves the others and moves closer to the extraction point and waits for the final day.
Bulent strikes me as being a misanthrope and misogynist. Being a loner, I don't know why he would want to join the others. Bulent must know that if he throws in with Jon, Gwen, Sarah, and Suzanne, he runs the risk of them judging him and ban