The only model shots in this scene; pretty well-done... splash one chopper!!
...and the other!! Good thing bad guys are always so stupid in the movies...

Exit the hero, etc., etc. I won't give away the ending of the movie; you'll have to rent it and see.
Giving credit where it's due:
This was one of Tallman's last projects: ironically, he was killed flying VFR into bad weather in a Piper, after years of crazy stunt-flying. Scud running... never a good idea, no matter how skilled and experienced the pilot.
http://en.wikipedia.org/wiki/Frank_Tallman