No helicopter after Fang spoke to MO

I went to speak with Fly ....then i get out and Fang tell's me to i get ready for action but hold your fire and take a good look at your guests first !
I am stuck cause there is no sound of a helicopter and no guest arrives !
Please help !

EDIT: I didn't find any info portion of that helicopter with panter and astrologer !
Someone help please !

EDIT: In the part of info portion i think there is a bug possibly related to this.
There are info portions that start muha_something and in the end of muha infoportion there's  a muxa_final_say_start instead of muha_final_say_start.
Could be the infoportion that i needed but is wrong written.

The "guests" have always arrived for me, but others have reported this bug in the past. Unfortunately I can't remember the outcome. 

I will have a look later today when I have time (currently waiting for an electrician to replace my electricity meter, so I will be without power for a while... )


EDIT: Okay, this worked for me...

I don't usually have a problem here, so this time I didn't enter the cave to talk to Fly, I just stayed outside with Fang - so the helicopter scene didn't trigger.

I used info portion vert_aver_pantera to spawn the helicopter, but it just flew around and didn't land - so I don't know if this part is actually needed. 

I then used info portion posadka_pantera_vert and this spawned the 'guests' on the hill. I was able to speak to them, then to Fang, then Fang & Fly left for the Stalker camp as expected.

In your case I would try it after talking to Fly, but if that doesn't work try it as I did. (This skips over the conversation with Fly in the cave, but I don't think it misses anything important. You may also want to check the cave for loot.)

Hope this helps.